Results 41 to 50 of about 7,932,226 (201)

Attribution of subseasonal cold‐spell forecasts to remote drivers using nudging experiments

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Nudging experiments with the European Centre for Medium‐Range Weather Forecasts (ECMWF) model show that Northern European cold spells can arise from different drivers. Some events are predominantly influenced by stratospheric dynamics, while others also involve important tropospheric processes.
Irene Erner, Alexey Karpechko, Inna Polichtchouk, Frédéric Vitart   +3 more
wiley   +1 more source

Error in ERA5 2‐m temperature identified using GraphCast

Quarterly Journal of the Royal Meteorological Society, EarlyView.
We identify a recurrent error in ERA5 2‐m temperature over the Ethiopian Highlands that occurs predominantly at 0600 UTC on ≈7%$$ \approx 7\% $$ of dates. The artefact is caused by the 2D optimal‐interpolation scheme assimilating temporally displaced surface reports (e.g., 0900 UTC) into the 0600 UTC analysis.
Hannah M. Christensen, Jack Barker, Bobby Antonio, Massimo Bonavita, Mohamed Dahoui, Patricia de Rosnay   +5 more
wiley   +1 more source

Expectation-maximization analysis of spatial time series [PDF]

Nonlinear Processes in Geophysics, 2007
Expectation maximization (EM) is used to estimate the parameters of a Gaussian Mixture Model for spatial time series data. The method is presented as an alternative and complement to Empirical Orthogonal Function (EOF) analysis.
K. W. Smith, A. L. Aretxabaleta
doaj  

Low-frequency variability of terrestrial water budget in China using GRACE satellite measurements from 2003 to 2010

Geodesy and Geodynamics, 2015
Mass variations in terrestrial water storage (TWS) obtained from eight years of satellite data from the Gravity Recovery and Climate Experiment (GRACE) are used to describe low frequency TWS through Empirical Orthogonal Function (EOF) analysis.
Kaixuan Kang, Hui Li, Peng Peng, Zhengbo Zou   +3 more
doaj   +1 more source

Decadal‐scale drivers of South Pacific hydroclimate variability

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Using prescribed SST perturbations in the IGCM4 model, we investigate the mechanisms by which three major modes of low‐frequency climate variability—the IPO, AMV, and Southern Ocean SST‐driven midlatitude jet shifts—modulate the South Pacific hydroclimate.
Daniel T. Skinner, Connor Robbins, Gordon N. Inglis, Manoj Joshi, Peter Langdon, Adrian J. Matthews, Mark Peaple, Timothy J. Osborn, David A. Sear   +8 more
wiley   +1 more source

KARAKTERISTIK OUTGOING LONGWAVE RADIATION (OLR) BERDASARKAN EMPIRICAL ORTHOGONAL FUNCTION (EOF) DAN KAITANNYA DENGAN CURAH HUJAN DI WILAYAH INDONESIA [CHARACTERISTICS OF OUTGOING LONGWAVE RADIATION (OLR) BASED ON EMPIRICAL ORTHOGONAL FUNCTION (EOF) AND TH [PDF]

, 2015
Metode Empirical Orthogonal Function (EOF) telah banyak digunakan pada berbagai penelitian untuk berbagai disiplin ilmu, dan salah satu aplikasinya untuk penelitian atmosfer.
Sofiati, Iis
core  

Evaluation of ERA5 Reanalysis Precipitation Over the Democratic People's Republic of Korea

Atmospheric Science Letters, Volume 27, Issue 11, November 2026.
This study comprehensively validates ERA5 reanalysis precipitation against 39 ground‐based stations in the DPRK over 40 years (1981–2020). Key findings reveal: (1) ERA5 shows moderate annual skill (CC = 0.77) with systematic intensity‐dependent biases—overestimating light winter precipitation (false alarms) and smoothing extreme summer monsoon events; (
Ju‐Song Kim, Kum‐Ryong Jo, Song‐Il Kim, Tong‐Hyok Shon, Ju‐Song Cha, Chol Paek   +5 more
wiley   +1 more source

An Ionosphere Specification Technique Based on Data Ingestion Algorithm and Empirical Orthogonal Function Analysis Method [PDF]

, 2018
A data ingestion method in reproducing ionospheric electron density and total electron content (TEC) was developed to incorporate TEC products from the Madrigal Database into the NeQuick 2 model.
Ridley, Aaron, Shunrong Zhang, Coster, Anthea J., Anthea J. Coster, Aaron Ridley, Huang, Wengeng, Liu, Siqing, Zhang, Shunrong, Aa, Ercha, Shasha Zou, Siqing Liu, Ercha Aa, Zou, Shasha, Wengeng Huang   +13 more
core   +1 more source

Basin‐Scale Marine Heatwave Types in the Gulf of Mexico: Wind–Humidity Controls on Latent Heat‐Loss Suppression and Ocean‐State Modulation of Vertical Thermal Structure

Journal of Geophysical Research: Oceans, Volume 131, Issue 11, November 2026.
Abstract Marine heatwaves (MHWs) in the Gulf of Mexico (GoM) have become more frequent and intense, yet the mechanisms governing basin‐scale events remain incompletely understood. EOF–k‐means clustering of event‐mean sea surface temperature anomalies (SSTA) during 1982–2024 identifies four recurrent, seasonally dependent spatial regimes: two stronger ...
Tianyi Lu, Jiabi Du
wiley   +1 more source

Stratospheric Circulation in the Southern Hemisphere: Links to Tropical Winds, Ozone, and the Hunga Eruption—Part 1: Evidence From ERA5 Reanalysis

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 20, 28 October 2026.
Abstract The interannual variability of the Southern Hemisphere polar vortex plays a key role in ozone depletion and recovery but this variability and its teleconnection patterns are less understood than in the Northern Hemisphere. Using ERA5 reanalysis data from 1980 to 2022 (43 years), we studied the variability of the Southern Hemisphere vortex by ...
Wandi Yu, Xinyue Wang, William J. Randel, Rolando R. Garcia, Paul A. Newman, Sean Davis, Karen H. Rosenlof   +6 more
wiley   +1 more source