Monsoon

About: Monsoon is a research topic. Over the lifetime, 16087 publications have been published within this topic receiving 599888 citations.

Interaction between anomalous winter monsoon in East Asia and El Nino events

Abstract: Based on a series of data analyses, the intimate relations between anomalous winter monsoon in East Asia and El Nino are studied in this paper. Anomalistic circulation in the Northern Hemisphere caused by El Nino event can lead to enhancing the Ferrel cell and the westerlies in the mid—latitudes as the Hadley cell and result in the location of the front zone in East Asia to the north. These are unfavourable for the cold wave breaking out southward in East Asia. Therefore, there are warmer weather and weaker winter monsoon in East Asia in El Nino winter. There are stronger and frequent cold waves in East Asia during the wintertime prior to the occurrence of El Nino event. They will induce stronger winter monsoon in East Asia. Thus, the weakened trade wind and enhanced cumulus convection in the equatorial middle—western Pacific area caused by the stronger winter monsoon will play an important role in the occurrence of El Nino event. Therefore, the anomalously strong winter monsoon in East Asia during wintertime might be an important mechanism to cause El Nino event.

Rainfall Anomalies in the Source Region of the Nile and Their Connection with the Indian Summer Monsoon

Abstract: In light of the droughts and subsequent food crises that have plagued the Ethiopia–Sudan region in the course of its history, and especially during the last 3 decades, the author examines both the interannual and intraseasonal variabilities of the July–September rains and compares them to the Indian summer monsoon. Regional rainfall indexes for the region stretching from Eritrea to Lake Victoria are computed using seasonal totals for the period 1901–88. Daily data for 1982–88 are also considered. Though all these regions are only partly affected by the Indian monsoon cross-equatorial flow and although they are separated from India by an extensive dry belt (Red Sea, Somalia, west Arabian Sea), there exists a close association between summer rainfall variations in India and in the western parts of East Africa. An even stronger relationship is revealed between these latter regions and Bombay surface pressure, with as much as 79% of the variance in common during 1953–88. This relationship has been vi...

Spatial and subseasonal patterns of the long‐term trends of Indian summer monsoon rainfall

Abstract: Long-term changes in the Indian monsoon rainfall on regional and local scales have important social and economic consequences. To present a comprehensive picture of such changes, the monthly rainfall data at 306 stations, well spread over India, have been analysed over 114 years (1871–1984), for long-term trends. The trends are quantified by linear trend for monthly as well as seasonal rainfall for each station. Some broad contiguous areas showing statistically significant trends have been identified. Areas of increasing trend in the monsoon seasonal rainfall are found along the west coast, north Andhra Pradesh and north-west India, and those of decreasing trend over east Madhya Pradesh and adjoining areas, north-east India and parts of Gujarat and Kerala. The subseasonal patterns indicate that the excess or deficiency of the monsoon rainfall is more frequently realized in the later half of the season. Monsoon rainfall tends to be more concentrated in August, over the west coast and central India.