diff --git a/products/carbon-fractions-toc-doc-dic-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json b/products/carbon-fractions-toc-doc-dic-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json
new file mode 100644
index 000000000..37f4fa53d
--- /dev/null
+++ b/products/carbon-fractions-toc-doc-dic-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json
@@ -0,0 +1,132 @@
+{ 
+  "type": "Collection",
+  "id": "carbon-fractions-toc-doc-dic-measured-from-coastal-waters-of-the-baltic-sea-in-20232024",
+  "title": "Carbon fractions (TOC, DOC, DIC) measured from coastal waters of the Baltic Sea in 2023–2024",
+  "updated": "2025-09-19T12:09:20Z",
+  "osc:status": "completed",
+  "osc:type": "product",
+  "stac_version": "1.0.0",
+  "description": "This dataset contains in situ measurements of carbon fractions—Dissolved Inorganic Carbon (DIC), Dissolved Organic Carbon (DOC), and Total Organic Carbon (TOC). In 2023 and 2024, we collected data from the coastal waters of the northern Baltic Sea in the frame of seasonal field campaigns. These campaigns were timed to capture a variety of biogeochemical and environmental conditions. The collected data provide insights into the distribution of organic and inorganic carbon in coastal waters, supporting applications such as marine carbon budget assessments, climate change research, and coastal ecosystem studies, as well as the validation of satellite-derived products and the improvement of coastal biogeochemical models in optically complex waters like the Baltic Sea. Water samples were collected from surface waters from various locations, and all carbon fraction analyses were conducted in accordance with EVS-EN 1484, and a Vario TOC analyser (Elementar GmbH, Germany) was used. DOC and DIC were measured from 0.45 µm filtered samples.",
+  "license": "CC-BY-NC-4.0",
+  "links": [
+    {
+      "rel": "root",
+      "href": "../../catalog.json",
+      "type": "application/json",
+      "title": "Open Science Catalog"
+    },
+    {
+      "rel": "via",
+      "href": "https://doi.pangaea.de/10.1594/PANGAEA.984586", 
+      "title": "Access"
+    },
+    {
+      "rel": "via",
+      "href": "https://doi.pangaea.de/10.1594/PANGAEA.984586", 
+      "title": "Documentation"
+    },
+    {
+      "rel": "parent",
+      "href": "../catalog.json",
+      "type": "application/json",
+      "title": "Products"
+    },
+    {
+      "rel": "related",
+      "href": "../../projects/on-the-possibility-of-mapping-carbon-fractions-in-coastal-waters-using-sentinel-2-msi-and-sentinel-3-olci-imagery-coastalcarbonmapper/collection.json",
+      "type": "application/json",
+      "title": "On the possibility of mapping carbon fractions in coastal waters using Sentinel-2 MSI and Sentinel-3 OLCI imagery - CoastalCarbonMapper" 
+    },
+    {
+      "rel": "related",
+      "href": "../../variables/dissolved-organic-carbon/catalog.json",  
+      "type": "application/json",
+      "title": "Dissolved Organic Carbon"
+    },
+    {
+    "rel": "related",
+    "href": "../../eo-missions/in-situ-observations/catalog.json",
+    "type": "application/json",
+    "title": "EO Mission: In-situ observations"
+    },
+    {
+      "rel": "related",
+      "href": "../../themes/oceans/catalog.json",
+      "type": "application/json",
+      "title": "Theme: Oceans"
+    },
+    {
+    "rel": "self",
+    "href": "https://esa-earthcode.github.io/open-science-catalog-metadata/products/carbon-fractions-toc-doc-dic-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json",
+    "type": "application/json"
+    },
+  ],
+  "stac_extensions": [
+    "https://stac-extensions.github.io/osc/v1.0.0/schema.json",
+    "https://stac-extensions.github.io/themes/v1.0.0/schema.json",
+    "https://stac-extensions.github.io/cf/v0.2.0/schema.json"
+  ],
+  "osc:project": "on-the-possibility-of-mapping-carbon-fractions-in-coastal-waters-using-sentinel-2-msi-and-sentinel-3-olci-imagery-coastalcarbonmapper",
+  "osc:region": "Baltic Sea",
+  "created": "2025-09-10T00:00:00Z",
+  "sci:doi": "10.1594/PANGAEA.984586",
+  "cf:parameter": [
+    {
+      "name": "dissolved_organic_carbon"
+    }
+  ],
+  "themes": [
+    {
+      "scheme": "https://github.com/stac-extensions/osc#theme",
+      "concepts": [
+        {
+          "id": "oceans"
+        }
+      ]
+    }
+  ],
+  "osc:variables": [
+    "dissolved-organic-carbon"
+  ],
+  "osc:missions": [
+    "in-situ-observations"
+  ],
+  "extent": {
+    "spatial": {
+      "bbox": [
+        [
+          23.900000000000002,
+          57.98000000000002,
+          24.67,
+          58.46000000000001
+        ],
+        [
+          23.29,
+          58.639999999999986,
+          24.01,
+          58.879999999999995
+        ],
+        [
+          24.459999999999997,
+          59.420000000000016,
+          24.85,
+          59.610000000000014
+        ],
+        [
+          25.42,
+          59.440000000000026,
+          26.3,
+          59.72
+        ]
+      ]
+    },
+    "temporal": {
+      "interval": [
+        [
+          "2023-04-10T00:00:00Z",
+          "2024-09-30T23:59:59Z"
+        ]
+      ]
+    }
+  },
+}
diff --git a/products/catalog.json b/products/catalog.json
index 25f04a0b7..5b8e5b3ae 100644
--- a/products/catalog.json
+++ b/products/catalog.json
@@ -1826,6 +1826,18 @@
       "rel": "self",
       "href": "https://esa-earthcode.github.io/open-science-catalog-metadata/products/catalog.json",
       "type": "application/json"
+    },
+    {
+      "rel": "child",
+      "href": "./carbon-fractions-toc-doc-dic-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json",
+      "type": "application/json",
+      "title": "Carbon fractions (TOC, DOC, DIC) measured from coastal waters of the Baltic Sea in 2023–2024"
+    },
+    {
+      "rel": "child",
+      "href": "./spectral-reflectance-and-associated-water-quality-parameters-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json",
+      "type": "application/json",
+      "title": "Spectral reflectance and associated water quality parameters measured from coastal waters of the Baltic Sea in 2023–2024"
     }
   ],
   "updated": "2024-09-12T20:32:22.975110Z",
diff --git a/products/spectral-reflectance-and-associated-water-quality-parameters-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json b/products/spectral-reflectance-and-associated-water-quality-parameters-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json
new file mode 100644
index 000000000..ed8a38dac
--- /dev/null
+++ b/products/spectral-reflectance-and-associated-water-quality-parameters-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json
@@ -0,0 +1,132 @@
+{
+  "type": "Collection",
+  "id": "spectral-reflectance-and-associated-water-quality-parameters-measured-from-coastal-waters-of-the-baltic-sea-in-20232024",
+  "title": "Spectral reflectance and associated water quality parameters measured from coastal waters of the Baltic Sea in 2023–2024",
+  "updated": "2025-09-13T12:14:52Z",
+  "osc:status": "completed",
+  "osc:type": "product",
+  "stac_version": "1.0.0",
+  "description": "The dataset contains in situ measurements of remote sensing reflectance (Rrs, sr⁻¹) and associated water quality parameters like coloured dissolved organic matter absorption (aCDOM), total suspended matter (TSM), suspended particulate inorganic matter (SPIM), suspended particulate organic matter (SPOM), and chlorophyll-a (Chl-a). In 2023 and 2024, we collected data from the coastal waters of the northern Baltic Sea in the frame of seasonal field campaigns. These campaigns were timed to capture a variety of environmental and optical conditions. This dataset can be used, for example, for the development and validation of satellite-based retrieval algorithms, improving our understanding of the optical properties of coastal waters, and studying biogeochemical processes in these complex environments. Water reflectance was measured with two (downwelling spectral irradiance, Ed; upwelling spectral radiance, Lu) Ramses (TriOS GmbH) spectrophotometers. \"Glint-free\" reflectance measurements were carried out, lowering the plastic tube, which surrounds the regular TriOS Ramses Lu sensor, just below the water surface. These glint-free reflectance values are brought out in the dataset. Water samples collected simultaneously with the optical measurements were analysed in the laboratory. TSM, SPIM, and SPOM were determined using the gravimetric method, in which a water suspension is filtered through a pre-weighed microfibre filter to determine the mass of particles retained on the filter. aCDOM spectra were measured from filtered (0.2 µm) water spectrophotometrically, using Milli-Q water as a reference. Chl-a concentration was determined using a spectrophotometric method based on pigment extraction with acetone and absorbance measurement in the visible range. Each water sample was analysed in two parallel replicates to improve reliability and enable quality control.",
+  "license": "CC-BY-4.0",
+  "links": [
+    {
+      "rel": "root",
+      "href": "../../catalog.json",
+      "type": "application/json",
+      "title": "Open Science Catalog"
+    },
+    {
+      "rel": "via",
+      "href": "https://doi.pangaea.de/10.1594/PANGAEA.984586", 
+      "title": "Access"
+    },
+    {
+      "rel": "via",
+      "href": "https://doi.pangaea.de/10.1594/PANGAEA.984586", 
+      "title": "Documentation"
+    },
+    {
+      "rel": "parent",
+      "href": "../catalog.json",
+      "type": "application/json",
+      "title": "Products"
+    },
+    {
+      "rel": "related",
+      "href": "../../projects/on-the-possibility-of-mapping-carbon-fractions-in-coastal-waters-using-sentinel-2-msi-and-sentinel-3-olci-imagery-coastalcarbonmapper/collection.json",
+      "type": "application/json",
+      "title": "On the possibility of mapping carbon fractions in coastal waters using Sentinel-2 MSI and Sentinel-3 OLCI imagery - CoastalCarbonMapper" 
+    },
+    {
+      "rel": "related",
+      "href": "../../variables/colored-dissolved-organic-matter/catalog.json",  
+      "type": "application/json",
+      "title": "Colored Dissolved Organic Matter"
+    },
+    {
+    "rel": "related",
+    "href": "../../eo-missions/in-situ-observations/catalog.json",
+    "type": "application/json",
+    "title": "EO Mission: In-situ observations"
+    },
+    {
+      "rel": "related",
+      "href": "../../themes/oceans/catalog.json",
+      "type": "application/json",
+      "title": "Theme: Oceans"
+    },
+    {
+      "rel": "self",
+      "href": "https://esa-earthcode.github.io/open-science-catalog-metadata/products/spectral-reflectance-and-associated-water-quality-parameters-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json",
+      "type": "application/json"
+    },
+  ],
+  "stac_extensions": [
+    "https://stac-extensions.github.io/osc/v1.0.0/schema.json",
+    "https://stac-extensions.github.io/themes/v1.0.0/schema.json",
+    "https://stac-extensions.github.io/cf/v0.2.0/schema.json"
+  ],
+  "extent": {
+    "spatial": {
+      "bbox": [
+        [
+          23.900000000000002,
+          57.98000000000002,
+          24.67,
+          58.46000000000001
+        ],
+        [
+          23.29,
+          58.639999999999986,
+          24.01,
+          58.879999999999995
+        ],
+        [
+          24.459999999999997,
+          59.420000000000016,
+          24.85,
+          59.610000000000014
+        ],
+        [
+          25.42,
+          59.440000000000026,
+          26.3,
+          59.72
+        ]
+      ]
+    },
+    "temporal": {
+      "interval": [
+        [
+          "2023-04-10T00:00:00Z",
+          "2024-09-30T23:59:59Z"
+        ]
+      ]
+    }
+  },
+  "osc:project": "on-the-possibility-of-mapping-carbon-fractions-in-coastal-waters-using-sentinel-2-msi-and-sentinel-3-olci-imagery-coastalcarbonmapper",
+  "osc:region": "Baltic Sea",
+  "created": "2025-09-10T00:00:00Z",
+  "sci:doi": "10.1594/PANGAEA.984586",
+  "osc:variables": [
+    "colored-dissolved-organic-matter"
+  ],
+  "osc:missions": [
+    "in-situ-observations"
+  ],
+  "cf:parameter": [
+    {
+      "name": "water_spectral_reflectance"
+    }
+  ],
+  "themes": [
+    {
+      "scheme": "https://github.com/stac-extensions/osc#theme",
+      "concepts": [
+        {
+          "id": "oceans"
+        }
+      ]
+    }
+  ]
+}
diff --git a/projects/catalog.json b/projects/catalog.json
index cfe75bbfc..15bc8da27 100644
--- a/projects/catalog.json
+++ b/projects/catalog.json
@@ -1120,6 +1120,12 @@
       "type": "application/json",
       "title": "deteCtion and threAts of maRinE Heat waves (CAREHeat)"
     },
+    {
+      "rel": "child",
+      "href": "./on-the-possibility-of-mapping-carbon-fractions-in-coastal-waters-using-sentinel-2-msi-and-sentinel-3-olci-imagery-coastalcarbonmapper/collection.json",
+      "type": "application/json",
+      "title": "On the possibility of mapping carbon fractions in coastal waters using Sentinel-2 MSI and Sentinel-3 OLCI imagery (CoastalCarbonMapper)"
+    },
     {
       "rel": "parent",
       "href": "../catalog.json",
@@ -1130,7 +1136,7 @@
       "rel": "self",
       "href": "https://esa-earthcode.github.io/open-science-catalog-metadata/projects/catalog.json",
       "type": "application/json"
-    }
+    },
   ],
   "updated": "2024-09-12T20:32:23.037110Z",
   "title": "Projects"
diff --git a/projects/on-the-possibility-of-mapping-carbon-fractions-in-coastal-waters-using-sentinel-2-msi-and-sentinel-3-olci-imagery-coastalcarbonmapper/collection.json b/projects/on-the-possibility-of-mapping-carbon-fractions-in-coastal-waters-using-sentinel-2-msi-and-sentinel-3-olci-imagery-coastalcarbonmapper/collection.json
new file mode 100644
index 000000000..6d054bbf9
--- /dev/null
+++ b/projects/on-the-possibility-of-mapping-carbon-fractions-in-coastal-waters-using-sentinel-2-msi-and-sentinel-3-olci-imagery-coastalcarbonmapper/collection.json
@@ -0,0 +1,131 @@
+{
+  "type": "Collection",
+  "id": "on-the-possibility-of-mapping-carbon-fractions-in-coastal-waters-using-sentinel-2-msi-and-sentinel-3-olci-imagery-coastalcarbonmapper",
+  "title": "On the possibility of mapping carbon fractions in coastal waters using Sentinel-2 MSI and Sentinel-3 OLCI imagery (CoastalCarbonMapper)",
+  "osc:status": "ongoing",
+  "osc:type": "project",
+  "stac_version": "1.0.0",
+  "description": "A thorough understanding of the global carbon pools and cycle is essential to understand and predict the effects of climate change. Coastal waters play a key role in the global carbon cycle but remain poorly understood due to their optical complexity, high spatial variability, and sensitivity to climate change. Satellite remote sensing data can provide high spatial and temporal resolution for carbon monitoring at local, regional, and global scales. However, existing sensors are not optimised for dynamic coastal zones. Sentinel-2 MSI (S2) offers high spatial resolution, while Sentinel-3 OLCI (S3) provides better spectral band configuration, temporal resolution, and radiometric sensitivity, though its spatial resolution may be insufficient for highly heterogeneous coastal waters. \nIn the ESA CoastalCarbonMapper project, we tested the applicability of both S3 and S2 for mapping carbon fractions—Total Organic Carbon (TOC), Dissolved Organic Carbon (DOC), Particulate Organic Carbon (POC), and Dissolved Inorganic Carbon (DIC)—in coastal waters. We aimed to develop and validate algorithms using in situ data and S2 and S3 imagery, addressing: (1) What are the optical proxies for different carbon fractions in coastal waters? (2) Which algorithms are most suitable for coastal carbon mapping? \nBio-optical and physical water parameters were measured directly in the field, and water samples were collected to analyse carbon fractions and optically active water constituents in the laboratory. Measurements at the test sites were taken four times during the ice-free season of 2023–2024. Based on the collected data, potential optical proxies were identified, and retrieval algorithms for carbon fractions were developed and validated. \nThe study represents a step forward in the remote sensing of coastal waters and Earth observation science. If adopted, the proposed carbon fraction products could allow for significant progress in different fields, from research to monitoring and policy making.",
+  "license": "CC-BY-4.0",
+  "extent": {
+    "spatial": {
+      "bbox": [
+        [
+          23.900000000000002,
+          57.98000000000002,
+          24.67,
+          58.46000000000001
+        ],
+        [
+          23.29,
+          58.639999999999986,
+          24.01,
+          58.879999999999995
+        ],
+        [
+          24.459999999999997,
+          59.420000000000016,
+          24.85,
+          59.610000000000014
+        ],
+        [
+          25.42,
+          59.440000000000026,
+          26.3,
+          59.72
+        ]
+      ]
+    },
+    "temporal": {
+      "interval": [
+        [
+          "2024-05-01T00:00:00Z",
+          "2025-10-31T23:59:59Z"
+        ]
+      ]
+    }
+  },
+  "links": [
+      {
+        "rel": "root",
+        "href": "../../catalog.json",
+        "type": "application/json",
+        "title": "Open Science Catalog"
+      },
+      {
+        "rel": "via",
+        "href": "https://mereinstituut.ut.ee/en/projects/CoastalCarbonMapper", 
+        "title": "Website"
+      },
+      {
+        "rel": "via",
+        "href": "https://eo4society.esa.int",
+        "title": "EO4Society Link"
+      },
+      {
+        "rel": "parent",
+        "href": "../catalog.json",
+        "type": "application/json",
+        "title": "Projects"
+      },
+      {
+        "rel": "child",
+        "href": "../../products/carbon-fractions-toc-doc-dic-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json",
+        "type": "application/json",
+        "title": "Carbon fractions (TOC, DOC, DIC) measured from coastal waters of the Baltic Sea in 2023–2024"
+      },
+      {
+        "rel": "child",
+        "href": "../../products/spectral-reflectance-and-associated-water-quality-parameters-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json",
+        "type": "application/json",
+        "title": "Spectral reflectance and associated water quality parameters measured from coastal waters of the Baltic Sea in 2023–2024"
+      },
+      {
+        "rel": "self",
+        "href": "https://esa-earthcode.github.io/open-science-catalog-metadata/projects/on-the-possibility-of-mapping-carbon-fractions-in-coastal-waters-using-sentinel-2-msi-and-sentinel-3-olci-imagery-coastalcarbonmapper/collection.json", # link to the description of the project
+        "type": "application/json"
+      },
+      {
+        "rel": "related",
+        "href": "../../themes/oceans/catalog.json",
+        "type": "application/json",
+        "title": "Theme: Oceans"
+      }
+  ],
+  "stac_extensions": [
+  "https://stac-extensions.github.io/osc/v1.0.0/schema.json",
+  "https://stac-extensions.github.io/themes/v1.0.0/schema.json",
+  "https://stac-extensions.github.io/contacts/v0.1.1/schema.json"
+  ],
+  "themes": [
+    {
+      "scheme": "https://github.com/stac-extensions/osc#theme",
+      "concepts": [
+        {
+          "id": "oceans"
+        }
+      ]
+    }
+  ],
+  "contacts": [
+      {
+        "name": "Marie-Helen Rio",
+        "emails": [
+          {
+            "value": "marie-helen.rio@esa.int"
+          }
+        ],
+        "roles": [
+          "technical_officer"
+        ]
+      },
+      {
+        "name": "Estonian Marine Institute",
+        "roles": [
+          "consortium_member"
+        ]
+      },
+  ],
+  "keywords": [
+  ]
+}
diff --git a/themes/oceans/catalog.json b/themes/oceans/catalog.json
index db2aad13c..4169315ae 100644
--- a/themes/oceans/catalog.json
+++ b/themes/oceans/catalog.json
@@ -649,6 +649,18 @@
       "rel": "self",
       "href": "https://esa-earthcode.github.io/open-science-catalog-metadata/themes/oceans/catalog.json",
       "type": "application/json"
+    },
+    {
+      "rel": "child",
+      "href": "../../products/carbon-fractions-toc-doc-dic-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json",
+      "type": "application/json",
+      "title": "Carbon fractions (TOC, DOC, DIC) measured from coastal waters of the Baltic Sea in 2023–2024"
+    },
+    {
+      "rel": "child",
+      "href": "../../products/spectral-reflectance-and-associated-water-quality-parameters-measured-from-coastal-waters-of-the-baltic-sea-in-20232024/collection.json",
+      "type": "application/json",
+      "title": "Spectral reflectance and associated water quality parameters measured from coastal waters of the Baltic Sea in 2023–2024"
     }
   ],
   "updated": "2024-08-27T17:27:42.202831Z",