Blar i Geophysical Institute på tidsskrift "Journal of Climate"
Viser treff 1-20 av 33
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Arctic/Atlantic exchanges via the Subpolar Gyre
(Peer reviewed; Journal article, 2012)In the present study we investigate the decadal variability in the strength and shape of the Subpolar Gyre (SPG) in a 600-year pre-industrial simulation using the Bergen Climate Model. The atmospheric influence on the SPG ... -
The Atlantic Multidecadal Variability phase-dependence of teleconnection between the North Atlantic Oscillation in February and the Tibetan Plateau in March
(Journal article; Peer reviewed, 2021)The Tibetan Plateau (TP), referred to as the “Asian water tower,” contains one of the largest land ice masses on Earth. The local glacier shrinkage and frozen-water storage are strongly affected by variations in surface ... -
Characteristics of Cold-Air Outbreak Events and Associated Polar Mesoscale Cyclogenesis over the North Atlantic Region
(Journal article; Peer reviewed, 2021)Equatorward excursions of cold polar air masses into ice-free regions, so-called Cold Air Outbreaks (CAO), are frequently accompanied by the development of severe mesoscale weather features. Focusing on two key regions, ... -
Comparison of wind speed and wave height trends from twentieth-century models and satellite altimeters
(Journal article; Peer reviewed, 2020)The trends in marine 10-m wind speed U10 and significant wave height Hs found in two century-long reanalyses are compared against a model-only integration. Reanalyses show spurious trends due to the assimilation of an ... -
The connection between the Southern Annular Mode and a feature-based perspective on Southern Hemisphere mid-latitude winter variability
(Journal article; Peer reviewed, 2020)This article provides a reconciling perspective on the two main, but contradictory, interpretations of the southern annular mode (SAM). SAM was originally thought to characterize meridional shifts in the storm track across ... -
Feature-Based Jet Variability in the Upper Troposphere
(Journal article; Peer reviewed, 2020)Jets in the upper troposphere constitute a cornerstone of both synoptic meteorology and climate dynamics, providing a direct link between weather and midlatitude climate variability. Conventionally, jet variability is often ... -
Global Attribution of Precipitation to Weather Features
(Journal article; Peer reviewed, 2024)Weather features, such as extratropical cyclones (ETCs), atmospheric rivers (ARs), and fronts, contribute to substantial amounts of precipitation globally. However, previous estimates of how much these individual features ... -
Global wind speed and wave height extremes derived from long-duration satellite records
(Peer reviewed; Journal article, 2019)The application of extreme-value analysis to long-duration (30 year) global altimeter and radiometer datasets is considered. In contrast to previous extreme-value analyses of satellite data, the dataset is sufficiently ... -
Impact of the Agulhas Current on Southern Africa Precipitation: A Modeling Study
(Journal article; Peer reviewed, 2021)The Agulhas Current (AC) creates a sharp temperature gradient with the surrounding ocean, leading to a large turbulent flux of moisture from ocean to atmosphere. We use two simulations of the Weather Research and Forecasting ... -
An Improved Estimate of the Coupled Arctic Energy Budget
(Peer reviewed; Journal article, 2019)This study combines state-of-the-art reanalyses such as the fifth-generation European Re-Analysis (ERA5) and the Ocean Reanalysis System 5 (ORAS5) with novel observational products to present an updated estimate of the ... -
Intensified Impacts of Central Pacific ENSO on the Reversal of December and January Surface Air Temperature Anomaly over China since 1997
(Journal article; Peer reviewed, 2021)The reversal of surface air temperature anomalies (SATA) in winter brings a great challenge for short-term climate prediction, and the mechanisms are not well understood. This study found that the reversal of SATA between ... -
Linking Instantaneous and Climatological Perspectives on Eddy-Driven and Subtropical Jets
(Journal article; Peer reviewed, 2023)The distinction between eddy-driven and subtropical jets is conceptually important and well-founded based on different driving mechanisms and dominant types of variability. This climatological perspective may be augmented ... -
Marine Wind and Wave Height Trends at Different ERA-Interim Forecast Ranges
(Peer reviewed; Journal article, 2015-01-15)Trends in marine wind speed and significant wave height are investigated using the global reanalysis ERA-Interim over the period 1979–2012, based on monthly-mean and monthly-maximum data. Besides the traditional reanalysis, ... -
Mechanisms of decadal North Atlantic climate variability and implications for the recent cold anomaly
(Journal article; Peer reviewed, 2021)Decadal sea surface temperature (SST) fluctuations in the North Atlantic Ocean influence climate over adjacent land areas and are a major source of skill in climate predictions. However, the mechanisms underlying decadal ... -
Mechanisms of regional winter sea-ice variability in a warming arctic
(Journal article; Peer reviewed, 2021)The Arctic winter sea ice cover is in retreat overlaid by large internal variability. Changes to sea ice are driven by exchange of heat, momentum, and freshwater within and between the ocean and the atmosphere. Using a ... -
The mechanisms that determine the response of the Northern Hemisphere’s stationary waves to North American Ice Sheets
(Peer reviewed; Journal article, 2019-07-01)Stationary waves describe the persistent meanders in the west–east flow of the extratropical atmosphere. Here, changes in stationary waves caused by ice sheets over North America are examined and the underlying mechanisms ... -
Mitigating climate biases in the midlatitude North Atlantic by increasing model resolution: SST gradients and their relation to blocking and the jet
(Journal article; Peer reviewed, 2022)Starting to resolve the oceanic mesoscale in climate models is a step change in model fidelity. This study examines how certain obstinate biases in the midlatitude North Atlantic respond to increasing resolution (from 1° ... -
Nonlinear response of atmospheric blocking to early Winter Barents-Kara seas warming: An idealized model study
(Journal article; Peer reviewed, 2021)Wintertime Ural blocking (UB) has been shown to play an important role in cold extremes over Eurasia, and thus it is useful to investigate the impact of warming over the Barents–Kara Seas (BKS) on the behavior of Ural ... -
Nonstationarity in the NAO–Gulf Stream SST Front Interaction
(Journal article; Peer reviewed, 2024)The interaction between the North Atlantic Oscillation (NAO) and the latitudinal shifts of the Gulf Stream sea surface temperature front (GSF) has been the subject of extensive investigations. There are indications of ... -
North Atlantic Modulation of Interdecadal Variations in Hot Drought Events over Northeastern China
(Journal article; Peer reviewed, 2020)Based on the long-term reanalysis datasets and the multivariate copula method, this study reveals that the frequency of summer hot drought events (SHDEs) over northeastern China (NEC) shows interdecadal variations during ...