Global atmospheric energetics from NCEP-Reanalysis 2 and ECMWF-ERA40 Reanalysis

2009 ◽  
Vol 29 (2) ◽  
pp. 159-174 ◽  
Author(s):  
Carlos A. F. Marques ◽  
Alfredo Rocha ◽  
João Corte-Real ◽  
José M. Castanheira ◽  
Juan Ferreira ◽  
...  
Keyword(s):  
Ncep Reanalysis ◽  
Era40 Reanalysis ◽  
Atmospheric Energetics

scholarly journals Cyclonic and anticyclonic contributions to atmospheric energetics

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Satoru Okajima ◽  
Hisashi Nakamura ◽  
Yohai Kaspi
Keyword(s):  
Storm Track ◽  
Mean Flow ◽  
Weather Variability ◽  
Jet Streams ◽  
Near Surface ◽  
Westerly Jet ◽  
Track Dynamics ◽  
New Findings ◽  
Atmospheric Energetics ◽  
Thermally Driven

AbstractMigratory cyclones and anticyclones account for most of the day-to-day weather variability in the extratropics. These transient eddies act to maintain the midlatitude jet streams by systematically transporting westerly momentum and heat. Yet, little is known about the separate contributions of cyclones and anticyclones to their interaction with the westerlies. Here, using a novel methodology for identifying cyclonic and anticyclonic vortices based on curvature, we quantify their separate contributions to atmospheric energetics and their feedback on the westerly jet streams as represented in Eulerian statistics. We show that climatological westerly acceleration by cyclonic vortices acts to dominantly reinforce the wintertime eddy-driven near-surface westerlies and associated cyclonic shear. Though less baroclinic and energetic, anticyclones still play an important role in transporting westerly momentum toward midlatitudes from the upper-tropospheric thermally driven jet core and carrying eddy energy downstream. These new findings have uncovered essential characteristics of atmospheric energetics, storm track dynamics and eddy-mean flow interaction.

scholarly journals Retrieval of Layer Averaged Relative Humidity Profiles from MHS Observations over Tropical Region

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
R. K. Gangwar ◽  
B. S. Gohil ◽  
A. K. Mathur
Keyword(s):  
Relative Humidity ◽  
Radiative Transfer ◽  
Reanalysis Data ◽  
Tropical Region ◽  
Atmospheric Layer ◽  
Ncep Reanalysis ◽  
Microwave Humidity Sounder ◽  
Using Data ◽  
Profile Errors ◽  
Humidity Profiles

The present paper deals with the retrieval of the atmospheric layer averaged relative humidity profiles using data from the Microwave Humidity Sounder (MHS) onboard the MetOp satellite. The retrieval has been innovatively performed by firstly retrieving humidity for pairs of thick overlapping layers (TOLs) used subsequently to derive humidity for associated thin isolated layer (TIL). A water vapour dependent (WVD) algorithm has been developed and applied to infer the humidity of TOLs. Thus, the retrieved profiles have been finally compared with standard algorithm (NORM). These algorithms have been developed based on radiative transfer simulations and study of sensitivities of MHS channels on humidity of various types of layers (TOL, TIL). The algorithm has been tested with MHS data and validated using concurrent radiosonde as well as NCEP reanalysis data indicating profile errors of ~15% and ~19%, respectively.

Atmospheric energetics over the tropical Indian Ocean during Indian Ocean dipole events

2018 ◽  
Vol 52 (9-10) ◽  
pp. 6243-6256 ◽  
Author(s):  
Yuehong Wang ◽  
Jianping Li ◽  
Yazhou Zhang ◽  
Qiuyun Wang ◽  
Jianhuang Qin
Keyword(s):  
Indian Ocean ◽  
Indian Ocean Dipole ◽  
Tropical Indian Ocean ◽  
Atmospheric Energetics

Analysis of Air Flow and Turbulent Fluxes Features of Night Fog

2011 ◽  
Vol 137 ◽  
pp. 297-301
Author(s):  
Bin Gui Wu ◽  
Zhao Yu Wang ◽  
Yi Yang Xie
Keyword(s):  
Bohai Sea ◽  
Lower Layer ◽  
Air Flow ◽  
Local Area ◽  
Turbulent Fluxes ◽  
Reanalysis Data ◽  
Ncep Reanalysis ◽  
Radiation Fog ◽  
Vapor Transfer ◽  
Tianjin City

The air flow and turbulent fluxes features during the radiation fog formed on the dawn of 17 October 2007 is discussed in order to study the mechanism of an unexpected night fog, based on the meteorological and turbulent data obtained from the 250 m height tower in Tianjin, as well as the NCEP reanalysis data and other observational data. The results show that the lower layer easterly flow coming from the south region of the Northeast cold high pressure led to remarkable temperature fall and humidity value increase in the daytime prior to the fog formation, which quickly turned the dry boundary layer to be moist. The vapor transfer indicated that the vapor of the radiation fog was provided by the easterly advection from Bohai Sea, not from local area. Turbulent vapor fluxes increased ten times as that before the fog. The horizontal vapor fluxes transported against the wind direction, which led to the escape of water vapor from Tianjin city and the dissipation of fog.

Comparison of surface variables from ERA and NCEP reanalysis with station data over eastern China

2011 ◽  
Vol 107 (3-4) ◽  
pp. 611-621 ◽  
Author(s):  
Zhaofei Liu ◽  
Zongxue Xu ◽  
Zhijun Yao ◽  
Heqing Huang
Keyword(s):  
Eastern China ◽  
Ncep Reanalysis ◽  
Station Data
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