scholarly journals Inertia-gravity waves associated with the tropical easterly jet over the Indian subcontinent during the South West Monsoon Period

2000 ◽  
Vol 27 (19) ◽  
pp. 3201-3204 ◽  
Author(s):  
M. N. Sasi ◽  
Geetha Ramkumar ◽  
V. Deepa ◽  
B. V. Krishna Murthy
Keyword(s):  
Gravity Waves ◽  
Indian Subcontinent ◽  
The South ◽  
Monsoon Period ◽  
South West ◽  
Tropical Easterly Jet ◽  
South West Monsoon ◽  
West Monsoon ◽  
Inertia Gravity Waves

INDIAN MONSOON: IN THE CONTEXT OF CURRENT

2020 ◽  
Vol 5 (12) ◽  
pp. 318-321
Author(s):  
Chandra kanta Sharma
Keyword(s):  
Indian Subcontinent ◽  
Southwest Monsoon ◽  
The South ◽  
South West ◽  
South West Monsoon ◽  
Average Rainfall ◽  
The Indian Ocean ◽  
Monsoon Winds ◽  
Northwest Region ◽  
West Monsoon

The monsoon in India is called the summer winds which are active in South Asia from June to September. These winds flow from the Indian Ocean, the Bay of Bengal and the Arabian Sea towards the Indian subcontinent. Their direction is towards the south-west and south-north, hence the monsoon winds are also known as the south-west monsoon winds. The southwest monsoon provides 70% of the total rainfall in the country. But this year, the country has received less than average rainfall, which was 5.2%. The northwest region of the country recorded the highest decrease of 10 percent. After good rainfall in June and July, the monsoon in the country remained weak during August and September.   भारत में मानसून उन ग्रीष्मकालीन हवाओं को कहते हैं जो दक्षिण एशिया में जून से सितंबर तक सक्रिय रहती हैं। ये हवाएं हिन्दमहासागर, बंगाल की खाड़ी और अरबसागर से भारतीय उपमहाद्वीप की ओर प्रवाहित होती है। इनकी दिशा दक्षिण-पश्चिम और दक्षिण-उत्तर की ओर होती है अतः मानसूनी हवाओं को दक्षिण-पश्चिम मानसूनी हवाओं के नाम से भी जाना जाता है। दक्षिण-पश्चिम मानसून देश में कुल वर्षा का 70% भाग प्रदान करता है। लेकिन इस वर्ष देश में औसत से कम वर्षा दर्ज की गई है संपूर्ण देश में 5.2% की कमी रही। देश के उत्तर – पश्चिम क्षेत्र में सबसे अधिक 10 फीसद की कमी दर्ज की गई। जून और जुलाई में अच्छे वर्षा के बाद अगस्त और सितंबर के दौरान देश में मानसून कमजोर रहा।

Recurrent landslides in Southern Western Ghats, India: A changing environmental perspective

2021 ◽  
Author(s):  
Asokan Laila Achu ◽  
Girish Gopinath
Keyword(s):  
Western Ghats ◽  
Hot Spot ◽  
Extreme Rainfall ◽  
Vital Role ◽  
Monsoon Period ◽  
Extreme Rainfall Events ◽  
South West ◽  
South West Monsoon ◽  
West Monsoon ◽  
The Western Ghats

<p>The Western Ghats (WG), an elevated passive continental margin along the southwestern coast of India, is the most widely populated biodiversity hot spot in the world. Monsoon climate is prevalent throughout the length of the Western Ghats. The WG region is prone to the occurrence of various hydro-climatic disasters such as extreme rainfall-driven floods and landslides. During the past 100 years, landslides and floods caused by extreme rainfall events in the WG have occurred in 1924 and 1979; but the most disastrous event, in terms of area of impact, loss of life and economic impact, occurred in August 2018. Generally, the south-west monsoon (Indian summer monsoon) occurs in the first week of June and extends up to September and the Indian Meteorological Department (IMD) predicted above-normal rainfall of 13% during the month of August 2018. But the State received an excess of 96% during the period from 1st to 30th August 2018, and 33% during the entire monsoon period till the end of August. The unprecedented heavy rains, storms, floods and associated thousands of landslides have caused exorbitant losses including 400 life losses, over 2.20 lakh people were displaced, and 20000 homes and 80 dams were damaged or destructed. This study aimed to elucidate the reasons behind the thousands of landslides caused in WG using observed and field evidences. Changes in south-west monsoon pattern and rainfall intensity played a vital role in the occurrence of landslides in WG. Further, the extensive causalities are the result of anthropogenic disturbances including landscape alterations and improper landuse practices in the hilly tracks of WG. The major causative factors for series of landslides in various segments of WG is due to hindrance of lower order streams/springs, vertical cutting, intensive quarrying, unscientific rain pits & man-made structures together with erratic rainfall triggered major and minor landslides in various segments of WG. The present investigation concludes that a scientific landuse policy and geoscientific awareness is essential to mitigate the environment.</p>

scholarly journals The Theory of the South-West Monsoon

Nature ◽  
1922 ◽  
Vol 109 (2726) ◽  
pp. 109-112
Author(s):  
L. C. W. BONACINA
Keyword(s):  
The South ◽  
South West ◽  
South West Monsoon ◽  
West Monsoon

scholarly journals Microseisms associated with disturbed weather in the Indian seas

1930 ◽  
Vol 229 (670-680) ◽  
pp. 287-328 ◽  
Keyword(s):  
North Atlantic ◽  
Arabian Sea ◽  
The State ◽  
The South ◽  
Monsoon Period ◽  
The North ◽  
Steady Vibrations ◽  
South West Monsoon ◽  
Seismic Records ◽  
West Monsoon

Seismologists have often noted the appearance of pronounced microseisms in seismic records when the weather has been disturbed over a neighbouring sea. For instance, the late Dr. KLOTZ suggested a relationship between disturbed weather in the north Atlantic and the largest microseismic movements at Ottawa. Dr. HARRISON, writing in ' Nature,’ November 1, 1924, in continuation of a note* by the present writer, pointed out that well-marked microseisms in the Omori charts at Calcutta invariably confirmed other evidence in the case of the early stages of dangerous cyclones, and were sometimes noticed when the storm centre was so much as 1000 miles south of Calcutta. He did not, however, recall any instance in which microseisms were associated with ordinary rough weather or with an advance of the monsoon. On the other hand, “ investigation at Eskdalemuir of the possible connection between microseismical amplitude and the state of the sea at different points of the British coasts have yielded results of an inconclusive kind. For example, the correlation between the state of the sea and the Microseismic movements of a type, which were quite characteristic of the south-west monsoon period, made their first appearance in the seismograms generally in May with the advance of the monsoon in the south-east Arabian Sea, becoming more and more pronounced as the monsoon currents approached Bombay. They became less marked or disappeared during a temporary break in the monsoon and reappeared with the strengthening of the currents. They were more or less steady vibrations having periods ranging from 4 to 10 seconds.

scholarly journals The Origin of the South-west Monsoon

Nature ◽  
1921 ◽  
Vol 107 (2683) ◽  
pp. 154-154 ◽  
Author(s):  
G. C. SIMPSON
Keyword(s):  
The South ◽  
South West ◽  
South West Monsoon ◽  
West Monsoon
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