scholarly journals The onset and advance of Indian summer monsoon in relation with the sea level pressure field

MAUSAM ◽  
2021 ◽  
Vol 61 (4) ◽  
pp. 553-564
Author(s):  
MEDHA KHOLE
Keyword(s):  
Sea Level ◽  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Pressure Field ◽  
Late Onset ◽  
Sea Level Pressure ◽  
North West ◽  
Level Pressure ◽  
Monsoon Winds ◽  
Onset Of Monsoon

The dates of onset of monsoon over Kerala and the advance of monsoon exhibit large interannual and intra seasonal variability. The genesis of Indian summer monsoon is considered to be in the southern hemisphere, over the Mascarene Island. The pressure gradient between the high pressure over Mascarene Island and low pressure over North West India is the fundamental physical cause of the monsoon, which acts as a driving force for the monsoon winds. Thus, the genesis of monsoon and its further advance is closely related to the sea level pressure field. With this backdrop, the variability of the onset and advance of the monsoon in terms of sea level pressure field is examined in this study.  The pentad sea level pressure field does show contrast for the years of early and late onset of monsoon over Kerala and also for the years of rapid and sluggish advance of monsoon.

scholarly journals CycloneDetector (v1.0) – Algorithm for detecting cyclone and anticyclone centers from mean sea level pressure layer

2021 ◽  
Author(s):  
Martin Prantl ◽  
Michal Žák ◽  
David Prantl
Keyword(s):  
Sea Level ◽  
Pressure Field ◽  
Detection Algorithm ◽  
Probability Of Detection ◽  
Image Processing Algorithm ◽  
Sea Level Pressure ◽  
Mean Sea Level ◽  
Level Pressure ◽  
Automatic Methods

Abstract. Automatic methods for identifying and tracking cyclones were firstly constructed in 1990's and since then there was a big increase in a precision and probability of detection. These methods have been traditionally focused on cyclones (and particularly on tropical cyclones), but the question of anticyclone centers detection remained unsolved since they are usually not a source of turbulent weather, precipitation etc. However, this issue can be important in the era of the climate change. In this paper, an algorithm for an automatic detection of both, cyclones and anticyclones based on mean sea level pressure field, is presented. The algorithm uses two-dimensional raster data as an input and returns a list of detected pressure systems. The main advantages of our solution are easy implementation since it is based on the standard image processing algorithm, sufficient performance of the algorithm, and especially the possibility of high-pressure systems detection. Moreover, the presented solution does not need a direct terrain filtering needed for some algorithms to be done. To validate the quality of detection algorithm results, a comparison against manually prepared data by Met Office was used. It follows from the comparison that the presented algorithm produces results similar to those by Met Office. The most significant differences can be found in the detection of cyclones at the beginning or the end of the lifespan stage. Met Office detects more cyclones in these stages than the presented solution.

scholarly journals Disentangling and quantifying contributions of distinct forcing factors to the observed global sea level pressure field

2019 ◽  
Vol 54 (3-4) ◽  
pp. 1453-1467
Author(s):  
Petru Vaideanu ◽  
Mihai Dima ◽  
Razvan Pirloaga ◽  
Monica Ionita
Keyword(s):  
Sea Level ◽  
Pressure Field ◽  
Sea Level Pressure ◽  
Level Pressure ◽  
Global Sea Level
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