Dr. Ajit Subramaniam

Pronouns: He/His
Lamont Research Professor, Biology and Paleo Environment, Lamont-Doherty Earth Observatory (LDEO), Columbia Climate School
Lecturer, M.S. in Sustainability Science School of Professional Studies
Affiliated with: Center for Science and Society
3 Marine Biology (Rm 122c) 61 Rt 9W Palisades, NY 10964

BIOGRAPHY:

Ajit Subramaniam is a Lamont Research Professor at the Lamont Doherty Earth Observatory of Columbia University and is an oceanographer with expertise in biogeochemical cycles, remote sensing, bio-optics, and phytoplankton physiology. He is interested in advancing our ability to observe the ocean and expand our understanding how the marine ecosystem works and can be managed. He has served as the Program Director for the Marine Microbiology Initiative at the Gordon and Betty Moore Foundation and a Program Director in the Biological Oceanography Program at the U.S. National Science Foundation. He has worked for the National Oceanic and Atmospheric Administration Coastal Services Center in Charleston, SC, the University of Maryland in College Park, and the University of Southern California in Los Angeles. Ajit earned his Ph.D. in Coastal Oceanography and M.S. in Marine Environmental Science from SUNY, Stony Brook. He has a Bachelors degree in Physics from The American College in India.

PROJECTS

Only select projects listed below

Name	Start Date	End Date
Ecosystem Impacts of Oil and Gas Inputs to the Gulf (ECOGIG)	9/1/11	12/31/15
Ecosystem Impacts of Oil and Gas Inputs to the Gulf (ECOGIG)	1/1/15	12/31/18
Nitrogen Fixation in the Equatorial Atlantic Upwelling System	6/18/15	9/30/17
RAPID: Rapid Assessment of Extent and Photophysiological Effects of the Deepwater Horizon Oil Spill	6/21/10	7/31/12
Multisensor Observation of Drivers of Phytoplankton Community Structure and Productivity in the Tropical Atlantic Ocean	2/1/21	1/31/24
Impact of the Amazon River Plume on nitrogen availability and planktonic food web dynamics in the Western Tropical North Atlantic	1/1/18	12/31/21
Qiñiġniaḷak qiñiġnaqsiḷugu: A Community Based Microbial Observatory, Narrative and Framework for Co-Production of Knowledge Practice	7/7/21	12/1/23
Travel: Symposium on Advances in Ocean Observation	3/1/22	2/28/23
Collaborative Research: Community Based Phytoplankton Observatory for Northwestern Alaska Coastal Waters	9/1/23	8/31/28

55 PUBLICATIONS ON COLUMBIA | ACADEMIC COMMONS

Only select publications listed below

Name	Published Date
An Improved Bio‐Physical Parameterization for Ocean Radiant Heating in Conditions of Near‐Surface Stratification	2024
Coastal trapped waves and tidal mixing control primary production in the tropical Angolan upwelling system	2024
Data For: An Improved Bio-Physical Parameterization for Radiant Heating in the Surface Ocean	2024
Good Practices in the Co-Production of Knowledge: Working Well Together in Environmental Change Research	2024
Modulation of Equatorial Currents and Tropical Instability Waves During the 2021 Atlantic Niño	2024
Nitrate Uptake and Primary Production Along the Amazon River Plume Continuum	2024
Planktonic habitats in the Amazon Plume region of the Western Tropical North Atlantic	2024
Spatial and temporal variability of water transparency, its primary drivers, and other optical properties in the Hudson River Estuary.	2024
Spatial and temporal variation in surface nitrate and phosphate in the Northern Gulf of Mexico over 35 years	2024
The Amazon River plume—a Lagrangian view	2024
The radiative and geometric properties of melting first-year landfast sea ice in the Arctic	2024
Ash Deposition Triggers Phytoplankton Blooms at Nishinoshima Volcano, Japan.	2023
A synergistic future for AI and ecology	2023
Characteristics of ringed seal Pusa hispida (‘natchiq’) denning habitat in Kotzebue Sound, Alaska, during a year of limited sea ice and snow	2023
Diatom-Diazotroph Associations in hydrographically defined habitats of the South China Sea	2023
Nitrogen fixation rates in the Guinea Dome and the equatorial upwelling regions in the Atlantic Ocean	2023
Symposium on Advances in Ocean Observation	2023
Trichodesmium around Australia: A view from space	2023
Cyanobacterial Diazotroph Distributions in the Western South Atlantic	2022
Iterative spatial leave-oneout cross-validation and gap-filling based data augmentation for supervised learning applications in marine remote sensing	2022
Mercury methylation linked to nitrification in the tropical North Atlantic Ocean	2022
Pumice Raft Detection Using Machine-Learning on Multispectral Satellite Imagery	2022
Quantifying Per-Cell Chlorophyll a in Natural Picophytoplankton Populations Using Fluorescence-Activated Cell Sorting.	2022
The Photophysiological Response of Nitrogen-Limited Phytoplankton to Episodic Nitrogen Supply Associated With Tropical Instability Waves in the Equatorial Atlantic	2022
Co-production of knowledge reveals loss of Indigenous hunting opportunities in the face of accelerating Arctic climate change	2021
Environmental Regulation of the Nitrogen Supply, Mean Trophic Position, and Trophic Enrichment of Mesozooplankton in the Mekong River Plume and Southern South China Sea	2021
Impact of Climate Variability of the Western Tropical Pacific on Maximum Salinity Water in the South China Sea	2021
Small pigmented eukaryote assemblages of the western tropical North Atlantic around the Amazon River plume during spring discharge	2021
The Winter Heat Budget of Sea Ice in Kotzebue Sound: Residual Ocean Heat and the Seasonal Roles of River Outflow	2021
Thin ice, deep snow and surface flooding in Kotzebue Sound: landfast ice mass balance during two anomalously warm winters and implications for marine mammals and subsistence hunting	2021
Accuracy of Empirical Satellite Algorithms for Mapping Phytoplankton Diagnostic Pigments in the Open Ocean: A Supervised Learning Perspective	2020
Comparison of Cloud-Filling Algorithms for Marine Satellite Data	2020
Using ship-deployed high-endurance unmanned aerial vehicles for the study of ocean surface and atmospheric boundary layer processes	2020
Habitat delineation in highly variable marine environments	2019
Are Extracted Materials Truly Representative of Original Samples? Impact of C18 Extraction on CDOM Optical and Chemical Properties	2016
Elevated surface chlorophyll associated with natural oil seeps in the Gulf of Mexico	2016
Highly variable nutrient concentrations in the Northern Gulf of Mexico	2016
Influence of the Amazon River Discharge on the Biogeography of Phytoplankton Communities in the Western Tropical North Atlantic	2014
Equatorial Upwelling Enhances Nitrogen Fixation in the Atlantic Ocean	2013
A Model for the Prediction of Harmful Algae Blooms in the Vietnamese Upwelling Area	2011
Nitrogen fixation by Trichodesmium spp. and unicellular diazotrophs in the North Pacific Subtropical Gyre	2011
Decadal time-series of SeaWiFS retrieved CDOM absorption and estimated CO₂ photoproduction on the continental shelf of the eastern United States	2009
Distribution and activity of diazotrophs in the Eastern Equatorial Atlantic	2009
Amazon River enhances diazotrophy and carbon sequestration in the tropical North Atlantic Ocean	2008
Causes and impacts of the 2005 Amazon drought	2008
Influence of the Amazon River plume on distributions of free-living and symbiotic cyanobacteria in the western tropical north Atlantic Ocean	2007
Seasonal variations in the Amazon plume-related atmospheric carbon sink	2007
An improved bio-optical model for the remote sensing of Trichodesmium spp. blooms	2005
Nitrogen fixation by Trichodesmium spp.: An important source of new nitrogen to the tropical and subtropical North Atlantic Oceean	2005
Estimates of atmospheric-processed soluble iron from observations and a global mineral aerosol model: Biogeochemical implications	2004
Influence of the Amazon River on the surface optical properties of the western tropical North Atlantic Ocean	2004
Bio-optical properties of the marine diazotrophic cyanobacteria Trichodesmium spp. I. Absorption and photosynthetic action spectra	1999
Bio-optical properties of the marine diazotrophic cyanobacteria Trichodesmium spp. II. A reflectance model for remote sensing	1999
Extensive bloom of a N₂-fixing diatom/cyanobacterial association in the tropical Atlantic Ocean	1999
An extensive bloom of the N₂-fixing cyanobacterium Trichodesmium erythraeum in the central Arabian Sea	1998

Staff and Affiliates Directory

Dr. Ajit Subramaniam

PROJECTS

55 PUBLICATIONS ON COLUMBIA | ACADEMIC COMMONS