Diagram showing oceanographic and hydrogeologic processes including submarine groundwater discharge on Ofu, American Samoa.
Ferdinand Oberle
Research Geologist with the USGS Pacific Coastal and Marine Science Center
Research Focus
2020-present: Geologist, USGS, Santa Cruz, CA, USA. I am currently involved in three fields of research: groundwater discharge through coastal aquifers; conceptualizing hydrologically and cryogenically driven permafrost erosion; and physicochemical drivers of coral reef health. I also created the Unmanned Aerial System Coastal Aquifer Project, which develops new drone-based technologies to investigate permafrost stability, wetlands, and aquifers. All projects have a strong interdisciplinary nature focusing on anthropogenic versus natural disturbances that rely on a multitude of oceanographic, marine geological, hydrogeological, and geochemical methods. As part of my older research interests I also continue to collaborate and advise on research focusing on the geological and geochemical consequences of bottom trawling.
Science and Products
Anthropogenic Nutrient Loading and Coral Health at Ofu, American Samoa
Declining water quality poses a significant and persistent threat to coral reefs worldwide, contributing to their widespread degradation. Identifying the specific impacts of water quality stressors is challenging due to the complex interplay of various physical and biological factors affecting reef health. Submarine groundwater discharge (SGD) plays a crucial role in transporting nutrients into...
Developing a USGS Digital Coral Growth Archive using Rotating X-Ray Computerized Tomography - The ACTS Project
The Archival Computed Tomography Scanning Project (ACTS) currently develops the USGS Coral Core Archive, housed at the Pacific and St. Petersburg Coastal and Marine Science Centers, that contains approximately 500 coral reef cores from U.S. jurisdictions worldwide. This archive, is one of the largest coral archives in the world and provides historical context for coral-reef science studies...
Coral Reef Project
Explore the fascinating undersea world of coral reefs. Learn how we map, monitor, and model coral reefs so we can better understand, protect, and preserve our Nation's reefs.
Hydrogeology and Reef Health
As part of the USGS Coral Reef Project, we are conducting geophysical and geochemical research to address questions about coastal groundwater-to-reef flow and coral reef health, with the goal of informing management decisions related to planning and implementing activities in priority watershed-coral reef systems.
Climate impacts to Arctic coasts
The Arctic region is warming faster than anywhere else in the nation. Understanding the rates and causes of coastal change in Alaska is needed to identify and mitigate hazards that might affect people and animals that call Alaska home.
Submarine Groundwater Discharge
We define submarine groundwater discharge (SGD) to consist either of fresh groundwater, re-circulated seawater, or a composite thereof. We evaluate and present SGD in terms of a vector for nutrient delivery to coastal waters.
Diagram showing oceanographic and hydrogeologic processes on Ofu, American Samoa
Diagram showing oceanographic and hydrogeologic processes including submarine groundwater discharge on Ofu, American Samoa.
Thermal image of ocean and groundwater
Thermal infrared image of two USGS researchers standing on the coastline and looking out (up on the image) over a coastal groundwater plume that is non-visible to the naked eye but can be observed in this thermal image due to the temperature differences between the cooler (blue) groundwater and warmer (pink) ocean water over the coral reefs.
Thermal infrared image of two USGS researchers standing on the coastline and looking out (up on the image) over a coastal groundwater plume that is non-visible to the naked eye but can be observed in this thermal image due to the temperature differences between the cooler (blue) groundwater and warmer (pink) ocean water over the coral reefs.
Conceptual drawing of ocean trawling
Conceptual drawing of bottom trawling from a fishing boat, showing a net and metal plate being dragged along the seafloor behind a boat on the surface.
Conceptual drawing of bottom trawling from a fishing boat, showing a net and metal plate being dragged along the seafloor behind a boat on the surface.
Science and Products
Anthropogenic Nutrient Loading and Coral Health at Ofu, American Samoa
Declining water quality poses a significant and persistent threat to coral reefs worldwide, contributing to their widespread degradation. Identifying the specific impacts of water quality stressors is challenging due to the complex interplay of various physical and biological factors affecting reef health. Submarine groundwater discharge (SGD) plays a crucial role in transporting nutrients into...
Developing a USGS Digital Coral Growth Archive using Rotating X-Ray Computerized Tomography - The ACTS Project
The Archival Computed Tomography Scanning Project (ACTS) currently develops the USGS Coral Core Archive, housed at the Pacific and St. Petersburg Coastal and Marine Science Centers, that contains approximately 500 coral reef cores from U.S. jurisdictions worldwide. This archive, is one of the largest coral archives in the world and provides historical context for coral-reef science studies...
Coral Reef Project
Explore the fascinating undersea world of coral reefs. Learn how we map, monitor, and model coral reefs so we can better understand, protect, and preserve our Nation's reefs.
Hydrogeology and Reef Health
As part of the USGS Coral Reef Project, we are conducting geophysical and geochemical research to address questions about coastal groundwater-to-reef flow and coral reef health, with the goal of informing management decisions related to planning and implementing activities in priority watershed-coral reef systems.
Climate impacts to Arctic coasts
The Arctic region is warming faster than anywhere else in the nation. Understanding the rates and causes of coastal change in Alaska is needed to identify and mitigate hazards that might affect people and animals that call Alaska home.
Submarine Groundwater Discharge
We define submarine groundwater discharge (SGD) to consist either of fresh groundwater, re-circulated seawater, or a composite thereof. We evaluate and present SGD in terms of a vector for nutrient delivery to coastal waters.
Diagram showing oceanographic and hydrogeologic processes on Ofu, American Samoa
Diagram showing oceanographic and hydrogeologic processes including submarine groundwater discharge on Ofu, American Samoa.
Diagram showing oceanographic and hydrogeologic processes including submarine groundwater discharge on Ofu, American Samoa.
Thermal image of ocean and groundwater
Thermal infrared image of two USGS researchers standing on the coastline and looking out (up on the image) over a coastal groundwater plume that is non-visible to the naked eye but can be observed in this thermal image due to the temperature differences between the cooler (blue) groundwater and warmer (pink) ocean water over the coral reefs.
Thermal infrared image of two USGS researchers standing on the coastline and looking out (up on the image) over a coastal groundwater plume that is non-visible to the naked eye but can be observed in this thermal image due to the temperature differences between the cooler (blue) groundwater and warmer (pink) ocean water over the coral reefs.
Conceptual drawing of ocean trawling
Conceptual drawing of bottom trawling from a fishing boat, showing a net and metal plate being dragged along the seafloor behind a boat on the surface.
Conceptual drawing of bottom trawling from a fishing boat, showing a net and metal plate being dragged along the seafloor behind a boat on the surface.