A5054209744- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Water Quality Monitoring and Analysis
- Coral and Marine Ecosystems Studies
- Water Quality Monitoring Technologies
- Oceanographic and Atmospheric Processes
- Environmental Changes in China
- Marine Biology and Ecology Research
- Fish Ecology and Management Studies
- Remote-Sensing Image Classification
- Species Distribution and Climate Change
- Atmospheric Ozone and Climate
- Remote Sensing and Land Use
- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Isotope Analysis in Ecology
- Water Quality and Pollution Assessment
- Calibration and Measurement Techniques
- Remote Sensing in Agriculture
- Air Quality Monitoring and Forecasting
- Nuclear Physics and Applications
- Flood Risk Assessment and Management
- Environmental and Agricultural Sciences
- Advanced Image Fusion Techniques
- Radiative Heat Transfer Studies
Scripps Institution of Oceanography
2016-2025
University of California, San Diego
2018-2025
Shell (United States)
2023
Chongqing Jiaotong University
2019
Purdue University West Lafayette
2012-2016
Nanjing Normal University
2011
The Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission will carry into space the Ocean Color Instrument (OCI), a spectrometer measuring at 5 nm spectral resolution in ultraviolet (UV) to near infrared (NIR) with additional bands shortwave (SWIR), and two multi-angle polarimeters that overlap OCI range spatial coverage. These instruments, especially when used synergy, have great potential for improving estimates of water reflectance post Earth Observing System era. Extending...
A powerful eruption within the Hunga Tonga-Hunga Ha’apai (HTHH) volcano (20.64°S, 175.19°W) in Kingdom of Tonga, occurred on 15 January 2022. The volcanic blast was enormous, leading many scientists to investigate full impact and magnitude this event via satellite observations. In study, we describe a new ocean color signature from discolored water patch created by HTHH using NASA CMEMS products satellite-derived biological optical properties. Elevated surface chlorophyll-a concentration...
Tropical islands 's oceanic biogeochemical environments may be influenced by continental forcing. The impact of the large Rewa River plume South main island Viti Levu (Fiji) on microbial processes i.e. carbon and nitrogen fluxes, fisheries richness or coral resources Fijian archipelago is unknown. SGLI imagery helpful in describing ocean color Fiji. In order to examine applicability colour algorithms for GCOM-C, situ bio-optical radiometric data were collected during March-April 2022...
Atmospheric correction (AC) of ocean color imagery faces significant challenges in regions with absorbing aerosols, adjacency effects, and optically complex waters, common coastal inland areas. Traditional algorithms, which extrapolate the atmospheric signal from near shortwave infrared to shorter wavelengths, often fail these conditions. To overcome this, top-of-atmosphere (TOA) undergoes principal component (PC) decomposition, retaining only PCs sensitive water signals, allows for precise...
Current satellite radiation products from polar-orbiting sensors like MODIS, SGLI, VIIRS, and OCI provide only daily averaged quantities, missing critical diurnal variations. These fluctuations in light energy, ranging none to ample throughout the day, significantly influence photosynthetic communities, impacting carbon export, nutrient cycling, ecosystem functions. Incorporating hourly changes phytoplankton absorption irradiance, as shown with GOCI data, has enhanced estimates of net...
System vicarious calibration (SVC) of satellite ocean-color sensors involves comparing retrievals water-leaving radiance (Lw) with in-situ measurements at the time overpass and adjusting coefficients to ensure agreement between retrieved measured quantities. This approach is designed reduce uncertainties associated purely radiometric techniques, which lack accuracy required for science applications, minimize biases introduced by atmospheric correction. For recently launched PACE Ocean Color...
Long-term, global ocean-color observations are needed for biogeochemistry and climate applications require integration across multiple satellite sensors. This study proposes a methodology cross-calibrating polar-orbiting sensors using geostationary reference sensor. The sensor serves as an intermediary, offering numerous coincidences in time geometry with sensors, particularly over oceanic regions where radiance levels typical remote sensing. is applied to cross-calibrate current including...
Knowing the spatial and temporal distribution of underwater light field, i.e., spectral angular structure radiant intensity at any point in water column, is essential to understanding biogeochemical processes that control composition evolution aquatic ecosystems their impact on climate reaction change. At present, only a few properties are reliably retrieved from space, either directly or via water-leaving radiance. Existing satellite products limited planar photosynthetically available...
Hyperspectral optical observations of the Earth’s surface oceans from space offer a means to improve our understanding ocean biology and biogeochemistry. NASA’s Plankton, Aerosol, Cloud, Ecosystem (PACE) satellite mission, which includes hyperspectral color instrument (OCI), will provide radiometric with near continuous spectral resolution across UV NIR range. Maintaining sufficient accuracy over lifetime missions requires robust program for system vicarious calibration (SVC) product...
A hand-held spectrometer was used to collect above-water spectral measurements for measuring optically active water-quality characteristics of the Wabash River and its tributaries in Indiana. Water sampling undertaken concurrent with estimate concentrations chlorophyll (chl) total suspended solids (TSS). method removing sky Sun glint from field spectra turbid inland waters developed tested. Empirical models were then using corrected situ chl TSS data. subset model development rest...
Checking the radiometric calibration of satellite hyper-spectral sensors such as PACE Ocean Color Instrument (OCI) while they operate in orbit and evaluating remote sensing reflectance, basic variable from which a variety optical biogeochemical ocean properties can be derived, requires measuring upwelling radiance just above surface ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="m1"><mml:mrow><mml:msub><mml:mi mathvariant="bold-italic">L</mml:mi><mml:mi...
A novel ocean profiling float system for calibrating and validating satellite-based color observations has been developed tested. The float-based radiometric sampling system, herein referred to as HyperNav, is complementary traditional moored in-situ observing systems provides additional capability due the relatively small platform size high accuracy that allows opportunistic deployments at locations during seasons conditions are best observations. purpose of this study optimize deployment...
Ocean color satellites require a procedure known as System Vicarious Calibration (SVC) after launch the pre-launch and on-orbit calibration accuracy is insufficient. The current approach for determination of post-launch SVC uses single fixed measurement location may be susceptible to unexpected biases in satellite processing algorithms. Here we describe novel program which based on high resolution radiometric system integrated with an autonomous profiling float (providing buoyancy engine,...
The vertical diffuse attenuation coefficient Kd (PAR) is used for calculating the euphotic zone, first optical depth that important primary productivity models. Currently, can be estimated using an irradiometer or a Secchi disk (SD). main objective of this work to define model applied wide range marine conditions estimate by SD. We irradiance profiles and SD (ZSD) from 679 stations in various regions. Three parametric models were developed, their statistical performance was evaluated view...
A comprehensive spectral-biogeochemical database was developed for the Wabash River and Tippecanoe in Indiana, United States. This includes spectral measurements of river water, coincident situ water quality parameters (chlorophyll (chl), non-algal particles (NAP), colored dissolved organic matter (CDOM)), nutrients (total nitrogen (TN), total phosphorus (TP), carbon (DOC)), water-column inherent optical properties (IOPs), depths, substrate types, bottom reflectance spectra collected summer...
Deterministic or statistical inversion schemes to retrieve ocean color from space often use a simplified water reflectance model that may introduce unrealistic constraints on the solution, disadvantage compared with standard, two-step algorithms make minimal assumptions about signal. In view of this, semi-analytical models Morel and Maritorena (2001), MM01, Park Ruddick (2005), PR05, used in spectral matching POLYMER algorithm (Steinmetz et al., 2011), are examined terms their ability...
The EPIC/DSCOVR observations of the Earth’s surface lit by Sun made from first Lagrange point several times during day in spectral bands centered on 443, 551, and 680 nm are used to estimate daily mean photosynthetically available radiation (PAR) at ice-free ocean surface. PAR algorithm uses a budget approach, which solar irradiance reaching is obtained subtracting arriving top atmosphere (known), reflected space (estimated EPIC Level 1b radiance data), taking account atmospheric...
The goal of the Photosynthetically available radiation (PAR) for Primary Production (3P) project is to provide robust, complete, and user-friendly satellite products ecosystem modeling, carbon cycle investigations, climate change monitoring. A specific objective design distribute a daily PAR product from MERIS potentially recent OLCI. In view this, algorithm, based on NASA Ocean Biology Processing Group (OBPG) operational has been developed. algorithm takes into account statistical diurnal...