Global Climatologies of Eulerian and Lagrangian Flow Features based on ERA-Interim

Sprenger, Michael; Fragkoulidis, Georgios; Binder, Hanin; Croci-Maspoli, Mischa; Graf, Pascal; Grams, Christian M.; Knippertz, Peter; Madonna, Erica; Schemm, Sebastian; Škerlak, Bojan; Wernli, Heini

doi:10.1175/bams-d-15-00299.1

Cited by 170 publications

(189 citation statements)

References 45 publications

Supporting

Mentioning

188

Contrasting

Order By: Relevance

“…Similarly to the SLOE composites, SNA cyclone frequencies are determined for the d + and the d − groups based on the identification method of Wernli and Schwierz () slightly updated by Sprenger et al . ().…”

Section: Methodsmentioning

confidence: 97%

On the link between the North Atlantic storm track and precipitation deuterium excess in Reykjavik

Aemisegger

2018

Atmospheric Science Letters

View full text Add to dashboard Cite

This study establishes a robust process-based dynamical link between the variability of the deuterium excess (d) in monthly winter precipitation in Reykjavik and the frequency of strong large-scale ocean evaporation (SLOE) events in the subpolar North Atlantic. SLOE events are induced by cold advection in the rear of extratropical cyclones. The link between SLOE and d emerges from the fact that a substantial fraction of moisture that precipitates in Reykjavik in winter originates from SLOE events. It is shown that positive anomalies of monthly d co-occur with positive anomalies in the frequency of SLOE events at the moisture source of Reykjavik precipitation. An intensification and a northeastwards shift of the North Atlantic storm track acts as a driver for the enhanced SLOE frequency in months with positive anomalies in d. This link also implies that in the subpolar North Atlantic, variations of d in monthly (or seasonal) precipitation reveal information about the storm track dynamics in the vicinity of Iceland. Potential implications of this finding for the interpretation of d as a proxy for the location and intensity of storm tracks are discussed. K E Y W O R D Satmospheric water cycle, extratropical cyclones, precipitation moisture sources, stable water isotopes, storm track dynamics, strong ocean evaporation

show abstract

Section: Methodsmentioning

confidence: 97%

On the link between the North Atlantic storm track and precipitation deuterium excess in Reykjavik

Aemisegger

2018

Atmospheric Science Letters

View full text Add to dashboard Cite

show abstract

“…Second, if local maxima occur in close proximity to each other (distance <800 km), we keep only the largest maximum for further tracking. Third, we employ the tracking algorithm by Wernli and Schwierz () with modifications by Sprenger et al ()—originally developed for the tracking of surface cyclones—to generate tracks of the TPVs. Fourth, we retain only tracks that last for at least 72 hr and attain a VAPV anomaly of 1.5 PVU or more at least once along the track.…”

Section: Methodsmentioning

confidence: 98%

On the Thermodynamic Preconditioning of Arctic Air Masses and the Role of Tropopause Polar Vortices for Cold Air Outbreaks From Fram Strait

et al. 2019

Self Cite

View full text Add to dashboard Cite

Fram Strait is a hot spot of Arctic cold air outbreaks (CAOs), which typically occur within the northerly flow associated with a strong low tropospheric east‐west pressure gradient between Svalbard and Greenland. This study investigates the processes in the inner Arctic that thermodynamically precondition air masses associated with CAOs south of Fram Strait where they lead to negative potential temperature anomalies often in excess of 15 K. Kinematic backward trajectories from Fram Strait are used to quantify the Arctic residence time and to analyze the thermodynamic evolution of these air masses. Additionally, the study explores the importance of cyclonic tropopause polar vortices (TPVs) for CAO formation south of Fram Strait. Results from a detailed case study and the climatological analysis of the 100 most intense CAOs from Fram Strait in the ERA‐Interim period reveal that (i) air masses that cause CAOs (CAO air masses) reside longer in the inner Arctic compared to those that do not (NO‐CAO air masses), and they originate from climatologically colder regions; (ii) the 10‐day accumulated cooling is very similar for CAO and NO‐CAO air masses indicating that the transport history and northerly origin of the air masses is more decisive for the formation of an intense negative temperature anomaly south of Fram Strait than an enhanced inner Arctic diabatic cooling; (iii) 40% (29%) of the top 40 (100) CAOs are related to a TPV in the vicinity of Fram Strait; (iv) TPVs confine anomalously cold air masses within their associated low tropospheric cold dome leading to enhanced accumulated radiative cooling.

show abstract

“…Further, we use an objective extratropical cyclone identification algorithm (described in detail in Wernli & Schwierz, and Sprenger et al, ), which identifies and tracks surface cyclones as closed sea level pressure contours that encompass a local sea level pressure minimum.…”

Section: Methodsmentioning

confidence: 99%

Quantifying the Local Effect of Northern Hemisphere Atmospheric Blocks on the Persistence of Summer Hot and Dry Spells

Röthlisberger

Martius

2019

Geophysical Research Letters

View full text Add to dashboard Cite

The persistence of heat waves and droughts is a key factor in determining their societal impact. Here, the local effect of atmospheric blocks on the persistence of summer hot and dry spells is quantified by comparing their climatological daily survival probability, that is, the probability to survive the next day, to their daily survival probability when they co‐occur with a block. The survival odds of hot spells are increased by more than 50% over most of the Northern Hemisphere extratropical land masses when co‐occurring with blocks. Dry spell persistence is also strongly increased by colocated blocks over western North America, Europe, and southern Russia, while it is significantly decreased over the western North Atlantic and the western North Pacific. These spatial differences in the effect of blocks on both spell types are explained by considering the spatially varying surface temperature and precipitation anomalies induced by the blocks.

show abstract

Global Climatologies of Eulerian and Lagrangian Flow Features based on ERA-Interim

Cited by 170 publications

References 45 publications

On the link between the North Atlantic storm track and precipitation deuterium excess in Reykjavik

On the link between the North Atlantic storm track and precipitation deuterium excess in Reykjavik

On the Thermodynamic Preconditioning of Arctic Air Masses and the Role of Tropopause Polar Vortices for Cold Air Outbreaks From Fram Strait

Quantifying the Local Effect of Northern Hemisphere Atmospheric Blocks on the Persistence of Summer Hot and Dry Spells

Contact Info

Product

Resources

About