A5061843357- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Oceanographic and Atmospheric Processes
- Microbial Community Ecology and Physiology
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Ocean Acidification Effects and Responses
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Remote Sensing and LiDAR Applications
- Polar Research and Ecology
- Fire effects on ecosystems
- Oil Spill Detection and Mitigation
- Atmospheric chemistry and aerosols
- Aquatic Ecosystems and Phytoplankton Dynamics
- Microbial Metabolic Engineering and Bioproduction
- Coastal wetland ecosystem dynamics
- Cryospheric studies and observations
- Arctic and Russian Policy Studies
- Geological formations and processes
- Water-Energy-Food Nexus Studies
- Atmospheric aerosols and clouds
- Scientific Computing and Data Management
- Global Energy and Sustainability Research
- Methane Hydrates and Related Phenomena
Oregon State University
2019-2025
University of California, Santa Barbara
2017-2020
Woods Hole Oceanographic Institution
2015
Massachusetts Institute of Technology
2015
The Ohio State University
2012-2015
Strong natural variability has been thought to mask possible climate-change-driven trends in phytoplankton populations from Earth-observing satellites. More than 30 years of continuous data were be needed detect a trend driven by climate change
Abstract How well do we know the particulate backscattering coefficient (b bp ) in global ocean? Satellite lidar b has never been validated globally and few studies have compared to derived from reflectances (via ocean color) or situ observations. Here, validate with autonomous biogeochemical Argo floats using a decorrelation analysis identify relevant spatiotemporal matchup scales inspired by geographical variability Rossby radius of deformation. We compare lidar, float, color at same...
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The goal of the EXport Processes in Ocean from RemoTe Sensing (EXPORTS) field campaign is to develop a predictive understanding export, fate, and carbon cycle impacts global ocean net primary production. To accomplish this goal, observations export flux pathways, plankton community composition, food web processes, optical, physical, biogeochemical (BGC) properties are needed over range ecosystem states. Here we introduce first EXPORTS deployment Station Papa Northeast Pacific during summer...
Space-based light detection and ranging (lidar) instruments can provide important measurements of ocean ecosystems that both complement passive color observations address some the limitations this latter traditional technology. To end despite being designed for atmospheric research, significant progress has been made in retrieving properties with Cloud-Aerosol Lidar Orthogonal Polarization (CALIOP) sensor using these data new science applications. Over course developments, processing...
Abstract Products derived from remote sensing reflectances (), for example, chlorophyll, phytoplankton carbon, euphotic depth, or particle size, are widely used in oceanography. Problematically, may have fewer degrees of freedom (DoF) than measured wavebands products. Here, we show that a global sea surface hyperspectral dataset has DoF = 4. MODIS‐like multispectral equivalent situ data also 4, while their SeaWiFS 3. Both multispectral‐equivalent datasets predict individual wavelengths'...
Extractive activities in the deep sea are poised to advance faster than science needed evaluate risks. Here, we call for a strong precautionary approach developing these industries.
We describe the basis of a theory for interpreting measurements two key biogeochemical fluxes—primary production by phytoplankton ( p , μg C · L −1 day ) and biological carbon export from surface ocean sinking particles f mg m −2 )—in terms their probability distributions. Given that are mechanistically linked but variable effectively measured on different scales, we hypothesize quantitative relationship emerges between collections measurements. Motivated many subprocesses driving export,...
Satellite retrievals of particulate backscattering (b
The net primary productivity (NPP) of marine phytoplankton is ~ 50 Pg C yr-1, and roughly 10-20% this NPP exported out the surface ocean as sinking particulate organic carbon (POC). Numerous mechanisms are hypothesized to control POC export but relative importance various remains poorly quantified on global scales. Here, we use a previously published satellite-based mechanistic model examine effects size-specific physical aggregation, temperature-dependent zooplankton fecal pellet...
The depth-attenuation of sinking particulate organic carbon (POC) is particular importance for the ocean's role in global cycle. Numerous idealized flux-versus-depth relationships are available to parameterize this process Earth System Models. Here we show that these statistically indistinguishable from POC flux profile data. Despite their quantitative similarity, also have very different implications leaving upper ocean, as well mechanisms governing flux. We discuss how tension might be...
Abstract Ocean biological processes mediate the transport of roughly 10 petagrams carbon from surface to deep ocean each year and thus play an important role in global cycle. Even so, globally integrated rate export out remains highly uncertain. Quantifying underlying this requires a synthesis between model predictions available observations particulate organic (POC) flux; yet scale dissimilarities models make difficult. Here we compare mechanistic with POC fluxes several data sets compiled...
Areas covered in compact sea ice were often assumed to prohibit upper-ocean photosynthesis. Yet, under-ice phytoplankton blooms (UIBs) have increasingly been observed the Arctic, driven by anthropogenic changes optical properties of Arctic ice. Here, we show evidence that Southern Ocean may also support widespread UIBs. We compile 77 time series water column samples from biogeochemical Argo floats profiled under (80%–100% concentration) austral spring–summer since 2014. find nearly all (88%)...
The year 2023 marked the tenth anniversary of first published description global ocean plankton stocks based on measurements from a satellite lidar. Diverse studies have since been conducted to further refine and validate lidar retrievals use them discover new characteristics seasonal dynamics marine animal migrations, as well evaluate geophysical products traditional passive color sensors. Surprisingly, all these developments achieved with instruments not designed for applications. Over...
icepyx is both a software library and community composed of ICESat-2 (NASA satellite) data users, developers, maintainers, the scientific community.We are working together to develop shared resources -including existing resources, new code, tutorials, use-cases/examples -that simplify process querying, obtaining, analyzing, manipulating datasets enable discovery.
Volcanic eruptions can be catastrophic events, particularly when they occur in inhabited coastal environments. They also play important roles climate and biogeochemical cycles, including through nutrient deposition the ocean. ash studies ocean have focused on phytoplankton response, generally quantifying changes chlorophyll-a concentration. Many gaps remain addressing fundamental questions regarding why volcanic may enhance or limit both growth and/or drive community composition shifts. Here...
Abstract The Thomas Fire ignited on December 5, 2017 and burned nearly 300,000 acres of land in Ventura Santa Barbara counties until January 12, 2018, making it the largest wildfire California history at time. During fire, a persistent plume ash, smoke, soot extended up to 1,000 km offshore over Channel (SBC). effect this ash influx SBC phytoplankton community was investigated with an Imaging FlowCytobot (IFCB) onboard R/V Sally Ride during research cruise mid‐December 2017. Over 100,000...
Abstract Little is known about Southern Ocean under‐ice phytoplankton, despite their suspected potential—ice and stratification conditions permitting—to produce blooms. We use a distributional approach to ask how sea ice phytoplankton characteristics are related, circumventing the dearth of co‐located data. leverage all available Argo float profiles, together with freeboard (height above level) lead (ice fractures yielding open water) data from ICESat‐2, describe co‐variations over time....
Abstract The biological carbon pump (BCP) transfers large amounts of from the atmosphere into ocean's interior, contributing to sequestration. Studies on latitudinal variability in organic transfer depth have yielded inconsistent results, likely due methodological differences. To address this, we compiled particulate (POC) flux data and BCP metrics time‐series locations across biogeographically distinct ocean regions. We integrated multiple observational techniques, including diverse...
Satellite observations of the ocean color are crucial for analyzing marine ecosystems and detecting changes in environment resulting from natural events human influence. A number satellites provide continuous since 1997. However, these have limitations as no products can be obtained during night-time, at high latitudes, through clouds. Additionally, measurements exponentially weighted to upper few meters ocean, with information about vertical structure. One way overcome those is use lidar...
The annual periodicity present in spectral remote sensing reflectances (Rrs(λ)) derived from ocean color satellite data processed by NASA's Ocean Biology Processing Group has been shown to diverge that observed situ, with the source of discrepancies remaining unresolved. Here we investigate such four sensors and seven situ locations. Periodicity time series Rrs(λ) spectra are examined without prior assumption main constituent frequency through application floating-mean Lomb-Scargle...
The annual periodicity present in spectral remote sensing reflectances (Rrs(λ)) derived from ocean color satellite data processed by NASA's Ocean Biology Processing Group has been shown to diverge that observed situ, with the source of discrepancies remaining unresolved. Here we investigate such four sensors and seven situ locations. Periodicity time series Rrs(λ) spectra are examined without prior assumption main constituent frequency through application floating-mean Lomb-Scargle...
ABSTRACT Increased anthropogenic stressors (e.g., warming, acidification, wildfires, and other extreme events) present complex observational challenges for Earth science, no one sensor can “do it all”. While many remote sensing technologies are available at present, scientific disciplines often trained to use only a specific subset, greatly limiting advancements. Here we open‐source software (icepyx) that lowers the barrier entry two platforms offering vertically‐resolved information about...