Results 81 to 90 of about 763 (175)

Demonstration, validation, and application of hyperspectral microscopy for the collection of cyanobacterial spectral signatures

Limnology and Oceanography: Methods, Volume 24, Issue 6, June 2026.
Abstract Cyanobacterial and other algal blooms are an environmental concern in waterbodies worldwide. While these blooms are a nuisance for recreational activities, they can also be harmful to human and wildlife health when the algae produce and release toxins.
Natalie C. Hall, Adam C. Mumford, Aaron M. Goldfain, David W. Allen, E. Terrence Slonecker, Alisa Shtabnoy, Carl J. Legleiter, Sarah A. Spaulding   +7 more
wiley   +1 more source

Adaptive Background Endmember Extraction for Hyperspectral Subpixel Object Detection

Remote Sensing
Subpixel object detection presents a significant challenge within the domain of hyperspectral image (HSI) processing, primarily due to the inherently limited spatial resolution of imaging spectrometers.
Lifeng Yang, Xiaorui Song, Bin Bai, Zhuo Chen   +3 more
doaj   +1 more source

Iron Fertilization of the North Pacific Did Not Drive Long‐Term Pliocene to Quaternary Cooling

AGU Advances, Volume 7, Issue 3, June 2026.
Abstract While several hypotheses exist to explain the development of large‐scale perennial Northern Hemisphere ice sheets in the late Pliocene and early Pleistocene, the prevailing view is that a decline in atmospheric carbon dioxide (CO2) drove this substantial change in late Neogene climate.
Jordan T. Abell, Gisela Winckler, Joshua D. Bridges, Robert F. Anderson, Timothy D. Herbert, Peter Molnar, Carmala Garzione   +6 more
wiley   +1 more source

Mapping Quartz and Feldspar Areal Abundance and Grain Sizes Using Integrated VTIR Data

AGU Advances, Volume 7, Issue 3, June 2026.
Abstract Mineral dust is sourced from arid regions around the globe, and its composition impacts regional and global environments by affecting radiation balance, cloud formation, nutrient deposition, and snowmelt. As such, mineral dust plays a key role in Earth's energy and biogeochemical budgets.
Kathleen Grant, Philip G. Brodrick, Carlos Pérez Garcia‐Pando, María Gonçalves Ageitos, Aaron J. Celestian, A. Joshua West   +5 more
wiley   +1 more source

Fractional Impervious Surface Mapping on Multispectral Images With Visible Shadows via a Bundle-Based Sparse Unmixing Model

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Impervious surface abundance (ISA) is an important indicator for monitoring urbanization and environmental disaster management processes. Commonly used spectral unmixing techniques extract ISA in the form of mixed pixels; however, in previous ...
Yanze Liu, Dacheng Li, Wei Xiong, Qijin Han, Lingling Ma   +4 more
doaj   +1 more source

Trace Metal Biogeochemistry in the Nordic Seas: Arctic and Atlantic Water Inflows Determine (Micro)Nutrient Availability

Global Biogeochemical Cycles, Volume 40, Issue 6, June 2026.
Abstract We present a data set of macronutrient and dissolved and total dissolvable trace metal concentrations collected in June 2012 across the Nordic Seas. Surface water and depth profiles of manganese, iron, cobalt, nickel, copper, zinc, phosphate, silicic acid, and NOx (nitrate + nitrite) reveal how warm saline Atlantic waters and cold fresh Arctic
Yaqing Ruan, Stephan Krisch, Thomas J. Browning, C. Mark Moore, Mario Esposito, Tim Steffens, Eric P. Achterberg   +6 more
wiley   +1 more source

East‐West Variability in Nitrogen Sources Sustaining Pelagic Food Webs in the Subtropical North Pacific Ocean Revealed by Stable Isotopic Analyses

Global Biogeochemical Cycles, Volume 40, Issue 6, June 2026.
Abstract Biological N2 fixation sustains pelagic ecosystems in subtropical oligotrophic waters. However, its impact on food webs as a nitrogen source remains poorly understood. Here, we quantified the contribution of diazotroph‐derived nitrogen to grazing food chains in the subtropical North Pacific in summer, where N2 fixation activity varies markedly
Sachiko Horii, Hiroaki Saito, Keitaro Fukushima, Yuji Onishi, Keisuke Koba, Ken Furuya, Kazutaka Takahashi   +6 more
wiley   +1 more source

Multidisciplinary Investigation of Healy Submarine Volcano (Kermadec Arc, New Zealand) Using AUV and Submersible Data: Structural Control on Magmatic and Hydrothermal Processes

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract We present a comprehensive multidisciplinary investigation of the Healy submarine volcano in the southern Kermadec arc, northeast of New Zealand. We show the first results of sidescan‐sonar data collected at a submarine arc volcano by an Autonomous Underwater Vehicle (AUV).
A. Bagnasco, F. Caratori Tontini, C. E. J. de Ronde, S. L. Walker, L. Cocchi, A. Ghirotto, E. Armadillo   +6 more
wiley   +1 more source

An Elliptic Kernel Unsupervised Autoencoder—Graph Convolutional Network Ensemble Model for Hyperspectral Unmixing

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Spectral unmixing is an important technique in remote sensing for analyzing hyperspectral images to identify endmembers and estimate fractional abundance maps.
Estefania Alfaro-Mejia, Carlos J. Delgado, Vidya Manian   +2 more
doaj   +1 more source

Standardized Frameworks for n‐Alkane Compound‐Specific Isotope Analysis: Assessments and Analytical Platform for Data Processing Workflows and Uncertainty Estimation

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 6, June 2026.
Abstract Post‐acquisition processing of plant wax n‐alkane isotope data in compound‐specific isotope analysis (CSIA) remains variable and often lacks transparency. To improve inter‐laboratory comparability and data reliability, we present standardized, reproducible workflows for CSIA that address key challenges in drift correction, scale normalization,
Julian Traphagan, Guangsheng Zhuang, Fan Yang   +2 more
wiley   +1 more source