Premium
Nocturnal jet and its effects on early morning rainfall peak over northeastern Bangladesh during the summer monsoon season
Author(s) -
Terao Toru,
Islam Md. Nazrul,
Hayashi Taiichi,
Oka Taro
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl026156
Subject(s) - morning , monsoon , radiosonde , climatology , rain gauge , nocturnal , environmental science , evening , troposphere , midnight , jet stream , atmospheric sciences , jet (fluid) , westerlies , wind speed , geology , meteorology , geography , oceanography , precipitation , medicine , physics , thermodynamics , astronomy
Diurnal variations of rainfall and upper wind over Bangladesh during the summer monsoon season were investigated through the data analysis of raingauge, 4‐times‐daily rawinsonde and pilot balloon observations. Over the northeastern part where the total monsoon rainfall is heavy a rainfall peak appears at 3 to 6 local time in the early morning. In the lower troposphere, the southeasterly accelerates in the evening, and the wind direction exhibits a clockwise change at night. This feature corresponds with the nocturnal jet, which can be a cause of the midnight‐early morning rainfall peak in the northeastern part of Bangladesh through the increased wind blowing against the southern edge of the Meghalaya Mountains.