Time variation of the mean sea level pressure over the major Mediterranean area

1990 ◽  
Vol 41 (3) ◽  
pp. 149-156 ◽  
Author(s):  
T. J. Makrogiannis ◽  
C. S. Sahsamanoglou
Keyword(s):  
Sea Level ◽  
Time Variation ◽  
Mediterranean Area ◽  
Sea Level Pressure ◽  
Mean Sea Level ◽  
Level Pressure ◽  
The Mean

scholarly journals Tropical cyclone simulations over Bangladesh at convection permitting 4.4 km & 1.5 km resolution

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Hamish Steptoe ◽  
Nicholas Henry Savage ◽  
Saeed Sadri ◽  
Kate Salmon ◽  
Zubair Maalick ◽  
...  
Keyword(s):  
Wind Speed ◽  
Tropical Cyclone ◽  
Sea Level ◽  
Tropical Cyclones ◽  
Weather Forecasting ◽  
Sea Level Pressure ◽  
Mean Sea Level ◽  
Level Pressure ◽  
Medium Range ◽  
Gust Speed

AbstractHigh resolution simulations at 4.4 km and 1.5 km resolution have been performed for 12 historical tropical cyclones impacting Bangladesh. We use the European Centre for Medium-Range Weather Forecasting 5th generation Re-Analysis (ERA5) to provide a 9-member ensemble of initial and boundary conditions for the regional configuration of the Met Office Unified Model. The simulations are compared to the original ERA5 data and the International Best Track Archive for Climate Stewardship (IBTrACS) tropical cyclone database for wind speed, gust speed and mean sea-level pressure. The 4.4 km simulations show a typical increase in peak gust speed of 41 to 118 knots relative to ERA5, and a deepening of minimum mean sea-level pressure of up to −27 hPa, relative to ERA5 and IBTrACS data. The downscaled simulations compare more favourably with IBTrACS data than the ERA5 data suggesting tropical cyclone hazards in the ERA5 deterministic output may be underestimated. The dataset is freely available from 10.5281/zenodo.3600201.

A reconstruction of Madras (Chennai) mean sea-level pressure using instrumental records from the late 18th and early 19th centuries

2002 ◽  
Vol 22 (9) ◽  
pp. 1119-1142 ◽  
Author(s):  
Rob J. Allan ◽  
Chris J. C. Reason ◽  
Penny Carroll ◽  
Phil D. Jones
Keyword(s):  
Sea Level ◽  
Sea Level Pressure ◽  
Mean Sea Level ◽  
Level Pressure ◽  
Instrumental Records

Solar influence on North Atlantic mean sea level pressure

Nature ◽  
1977 ◽  
Vol 269 (5626) ◽  
pp. 320-322 ◽  
Author(s):  
P. M. KELLY
Keyword(s):  
Sea Level ◽  
North Atlantic ◽  
Sea Level Pressure ◽  
Mean Sea Level ◽  
Level Pressure ◽  
Solar Influence

scholarly journals Simulation and Interpretation of the Genesis of Tropical Storm Gert (2005) as Part of the NASA Tropical Cloud Systems and Processes Experiment

2010 ◽  
Vol 67 (4) ◽  
pp. 999-1025 ◽  
Author(s):  
Scott A. Braun ◽  
Michael T. Montgomery ◽  
Kevin J. Mallen ◽  
Paul D. Reasor
Keyword(s):  
Sea Level ◽  
Tropical Storm ◽  
Sea Level Pressure ◽  
Cloud Systems ◽  
Low Level ◽  
Level Pressure ◽  
Stratiform Region ◽  
Stratiform Precipitation ◽  
Precipitation Processes ◽  
The Mean

Abstract Several hypotheses have been put forward for the mechanisms of generation of surface circulation associated with tropical cyclones. This paper examines high-resolution simulations of Tropical Storm Gert (2005), which formed in the Gulf of Mexico during NASA’s Tropical Cloud Systems and Processes Experiment, to investigate the development of low-level circulation and its relationship to the precipitation evolution. Two simulations are examined: one that better matches available observations but underpredicts the storm’s minimum sea level pressure and a second one that somewhat overintensifies the storm but provides a set of simulations that encapsulates the overall genesis and development characteristics of the observed storm. The roles of convective and stratiform precipitation processes within the mesoscale precipitation systems that formed Gert are discussed. During 21–25 July, two episodes of convective system development occurred. In each, precipitation system evolution was characterized by intense and deep convective upward motions followed by increasing stratiform-type vertical motions (upper-level ascent, low-level descent). Potential vorticity (PV) in convective regions was strongest at low levels while stratiform-region PV was strongest at midlevels, suggesting that convective processes acted to spin up lower levels prior to the spinup of middle levels by stratiform processes. Intense vortical hot towers (VHTs) were prominent features of the low-level cyclonic vorticity field. The most prominent PV anomalies persisted more than 6 h and were often associated with localized minima in the sea level pressure field. A gradual aggregation of the cyclonic PV occurred as existing VHTs near the center continually merged with new VHTs, gradually increasing the mean vorticity near the center. Nearly concurrently with this VHT-induced development, stratiform precipitation processes strongly enhanced the mean inflow and convergence at middle levels, rapidly increasing the midlevel vorticity. However, the stratiform vertical motion profile is such that while it increases midlevel vorticity, it decreases vorticity near the surface as a result of low-level divergence. Consequently, the results suggest that while stratiform precipitation regions may significantly increase cyclonic circulation at midlevels, convective vortex enhancement at low to midlevels is likely necessary for genesis.

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