Results 81 to 90 of about 1,111,541 (211)

Early development of anoxia prior to the main euxinic phase of the Jenkyns Event on the margin of the Western Tethys (Sachrang Basin, Eastern Alps)

Sedimentology, EarlyView.
ABSTRACT Although the global expansion of oxygen‐depleted marine environments during the Early Toarcian Jenkyns Event (or Toarcian Oceanic Anoxic Event) is primarily inferred from successions in the NW European epicontinental basins, the timing of the expansion of anoxia in Tethyan basins, where hydrography potentially played a minor role, is poorly ...
Tamás Müller, Stefan Neumeister, Jan Schlögl, Emanuela Mattioli, Hans‐Jürgen Gawlick, Thomas J. Algeo, Adam Tomašových   +6 more
wiley   +1 more source

Endmember extraction using a combination of orthogonal projection and genetic algorithm

, 2012
Common endmember extraction algorithms presume that the number of materials present is either known or may be predetermined by using spectral databases or other approaches. In this letter, we propose a new method called genetic orthogonal projection (GOP)
Schaepman, Michael E; https://orcid.org/, Rezaei, Y, Mobasheri, M R, Zoej, M J V, Y. Rezaei, M. J. Valaddan Zoej, M. E. Schaepman, M. R. Mobasheri   +7 more
core   +1 more source

Conditions and timing for the precipitation of early marine diagenetic dolomite in the Triassic Dolomia Principale (northern Italy)

Sedimentology, EarlyView.
ABSTRACT Thermodynamic constraints and empirical evidence often suggest that fabric‐retentive replacement dolomites are stable carbonate minerals that preserve ancient seawater properties. This study evaluates this hypothesis by examining the Upper Triassic Dolomia Principale in Northern Italy.
Vivien Folliot, Giovanna Della Porta, Mathias Mueller, Fabrizio Berra, Benjamin F. Walter, Aratz Beranoaguirre, Sylvia Riechelmann, Oskar Schramm, Adrian Immenhauser   +8 more
wiley   +1 more source

Endmember extraction from hyperspectral imagery based on QR factorisation using givens rotations

, 2019
Hyperspectral images are mixtures of spectra of materials in a scene. Accurate analysis of hyperspectral image requires spectral unmixing. The result of spectral unmixing is the material spectral signatures and their corresponding fractions.
Zhang, Geng, Wen, Desheng, Hu, Bingliang, Liu, Weihua, Wang, Shuang, Gan, Yuquan, Feng, Xiangpeng   +6 more
core   +1 more source

Assessment of spectral reduction techniques for endmember extraction in unmixing of hyperspectral images

, 2022
International audienceSpectral mixture modelling is one of the most important techniques for classifying hyperspectral data at sub-pixel resolution. The identification of spectrally pure endmembers for estimating their corresponding abundances is an ...
Rajendra Ternikar, Chirag, Misra, Arundhati, Gomez, Cécile, Sahadevan, Anand S, Ghosh, Ridhee, Kumar, Nagesh, D., Kumar Gupta, Praveen, George, Elizabeth Baby, Ahmad, Touseef, Sahadevan, Anand S., Gupta, Praveen Kumar, Kumar, Nagesh,, Ternikar, Chirag Rajendra, Nagesh Kumar, D.   +13 more
core   +2 more sources

Terrestrial inputs and in‐lake processes shape dissolved organic matter along a permafrost gradient

Limnology and Oceanography, Volume 71, Issue 11, November 2026.
Abstract Northern permafrost landscapes store large amounts of organic carbon that can enter lakes as dissolved organic matter (DOM), but links among shoreline terrestrial sources, lake‐water DOM composition, and catchment configuration remain uncertain in low‐precipitation Shield landscapes. We combined shoreline soil‐porewater and lake‐water sampling
Ryan H. S. Hutchins, Jeremy G. Leathers, Sherry L. Schiff, Michael C. English, Mackenzie Schultz, Jason J. Venkiteswaran, Suzanne E. Tank, Richard J. Elgood, Pieter J. K. Aukes   +8 more
wiley   +1 more source

Hidden subsurface suspended sediment export from Greenland's marine‐terminating glaciers

Limnology and Oceanography Letters, Volume 11, Issue 6, November 2026.
Abstract Runoff and calved ice volumes from the Greenland Ice Sheet are well constrained, but quantifying the associated suspended sediment flux remains challenging. Here we present near‐terminus observations from three glacierized fjords in southeast Greenland, combining full‐depth turbidity profiles and current velocity from summer 2024 to evaluate ...
Yaqing Ruan, Eric P. Achterberg, Hilde Oliver, Lukas L. Taenzer, Xin Huang, Camilla S. Andresen, Mark J. Hopwood   +6 more
wiley   +1 more source

Contrasting associations of sea‐ice meltwater and meteoric water with nitrogen uptake patterns in the summer Cosmonaut Sea, Antarctica

Limnology and Oceanography Letters, Volume 11, Issue 6, November 2026.
Abstract Nitrogen uptake by phytoplankton influences Southern Ocean productivity and carbon export, but how source‐resolved meltwater is associated with nitrate and ammonium use remains unclear. Here, 15N tracer incubations and a δ18O‐salinity mixing model were combined to examine nitrogen uptake in the early‐summer Cosmonaut Sea.
Kun Zhang, Qianyao Ma, Jun Zhao, Qiang Hao, Shunan Cao, Zifei Yang, Zhen Tang, Minfang Zheng, Mengya Chen, Jianfeng He, Min Chen   +10 more
wiley   +1 more source

A systematic 15N‐amino‐acid tracer framework to identify sources of pelagic marine organic matter

Limnology and Oceanography: Methods, Volume 24, Issue 11, November 2026.
Abstract Accurately tracing organic matter sources in marine systems remains challenging, particularly where natural and anthropogenic inputs coexist. Compound‐specific stable isotope analysis of amino acids (CSIA‐AA) offers strong potential for organic matter source discrimination, but its application is limited by the small number of validated δ15N ...
E. Cepeda, S. Bodé, P. Boeckx, J. Vanaverbeke, U. Braeckman, I. Lizaga   +5 more
wiley   +1 more source

Modeling Land-Cover Types Using Multiple Endmember Spectral Mixture Analysis in a Desert City [PDF]

Spectral mixture analysis is probably the most commonly used approach among sub-pixel analysis techniques. This method models pixel spectra as a linear combination of spectral signatures from two or more ground components.
Soe W. Myint, Gregory S. Okin
core