On the onset of the Indian southwest monsoon and the monsoon general circulation

Subbaramayya, I.; Ramanadham, R.

doi:10.1017/cbo9780511897580.017

Cited by 8 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Processes in North Africa and over the Indian subcontinent are coupled by the tropical easterly jet (e.g. Subbaramayya & Ramanadnam 1981) which is found near the tropical tropopause during boreal summer. The tropical easterly jet reaches from the West Pacific to Africa.…”

Section: Resultsmentioning

confidence: 99%

On multiple solutions of the atmosphere–vegetation system in present‐day climate

Laussen

1998

Global Change Biology

View full text Add to dashboard Cite

An asynchronously coupled global atmosphere–biome model is used to assess the stability of the atmosphere–vegetation system under present‐day conditions of solar irradiation and sea‐surface temperatures. When initialized with different land‐surface conditions (1, the continents, except for regions of inland ice, completely covered with forest; 2, with grassland; 3, with (dark) desert; and 4, with (bright) sand desert), the atmosphere–biome model finds two equilibrium solutions: the first solution yields the present‐day distribution of subtropical deserts, the second reveals a moister climate in North Africa and Central East Asia and thereby a northward shift of vegetation particularly in the south‐western Sahara. The first solution is obtained with initial condition 4, and the second with 1, 2, 3. When comparing these results with an earlier study of biogeophysical feedback in the African and Asian monsoon area, it can be concluded that North Africa is probably the region on Earth which is most sensitive considering bifurcations of the atmosphere–vegetation system at the global scale.

show abstract

Section: Resultsmentioning

confidence: 99%

On multiple solutions of the atmosphere–vegetation system in present‐day climate

Laussen

1998

Global Change Biology

View full text Add to dashboard Cite

show abstract

“…In line with the criterion for the onset given by Subbaramayya & Ramanadham (1981), it is proposed here that the withdrawal of the monsoon from any locality should be identified with the end of the last westwardmoving rainstorm of the season which is associated with the monsoon westerlies. The cessation of the rains and the south-westerlies on a long-term basis may either take place simultaneously or one may precede the other.…”

Section: Introductionmentioning

confidence: 60%

“…Following the criterion given by Subbaramayya & Ramanadham (1981) for the onset of the monsoon, it is proposed that 'the withdrawal of the monsoon from any locality should be identified with the end of the last westward-moving rainstorm of the season, which is associated with the monsoon westerlies'. This definition involves changes in both wind and rainfall as well as in the nature of the rainfall, unlike the other approaches, such as that of the India Meteorological Department (IMD), which considers only the change in rainfall.…”

Section: Discussionmentioning

confidence: 99%

“…Further, the method does not take the wind into consideration, though the monsoon is basically a wind phenomenon. These problems were examined by Subbaramayya & Bhanukumar (1978) and Subbaramayya & Ramanadham (1981), who gave a criterion to decide the onset of the monsoon in any given locality. The onset should be identified by the rain that is associated with the first westward-moving rainstorm (widespread, moderate to heavy rains generally due to low pressure systems) of the season accompanied by a broad belt of equatorial westerlies.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Withdrawal of the south‐west monsoon over India — A synoptic and climatological study

Subbaramayya

Naidu

1995

Meteorological Applications

View full text Add to dashboard Cite

“…However, very few studies have reported on the prediction of the onset date of the summer monsoon over India. Subbaramayya et al (1987;1990) developed the regression equation for the prediction of the onset date over different parts over India using wind field. Ramesh et al (1996) determined the onset date of monsoon over the southern tip of the Indian peninsula during 1995 based on kinetic energy and net tropospheric temperature.…”

Section: Introductionmentioning

confidence: 99%

Interannual variability of onset of the summer monsoon over India and its prediction

Raju

Mohanty²,

Bhatla

2007

Nat Hazards

View full text Add to dashboard Cite

In this article, the interannual variability of certain dynamic and thermodynamic characteristics of various sectors in the Asian summer monsoon domain was examined during the onset phase over the south Indian peninsula (Kerala Coast). Daily average (0000 and 1200 UTC) reanalysis data sets of the National Centre for Environmental Prediction/National Centre for Atmospheric Research (NCEP/NCAR) for the period 1948-1999 were used. Based on 52 years onset date of the Indian summer monsoon, we categorized the pre-onset, onset, and post-onset periods (each an average of 5 days) to investigate the interannual variability of significant budget terms over the Arabian Sea, Bay of Bengal, and the Indian peninsula. A higher difference was noticed in low-level kinetic energy (850 hPa) and the vertically integrated generation of kinetic energy over the Arabian Sea from the pre-onset, onset, and post-onset periods. Also, significant changes were noticed in the net tropospheric moisture and diabatic heating over the Arabian Sea and Indian peninsula from the pre-onset to the post-onset period. It appears that attaining the magnitude of 40 m 2 s -2 and then a sharp rise in kinetic energy at 850 hPa is an appropriate time to declare the onset of the summer monsoon over India. In addition to a sufficient level of net tropospheric moisture (40 mm), a minimum strength of low-level flow is needed to trigger convective activity over the Arabian Sea and the Bay of Bengal. An attempt was also made to develop a location-specific prediction of onset dates of the summer monsoon over India based on energetics and basic meteorological parameters using multivariate

show abstract

On the onset of the Indian southwest monsoon and the monsoon general circulation

Cited by 8 publications

References 0 publications

On multiple solutions of the atmosphere–vegetation system in present‐day climate

On multiple solutions of the atmosphere–vegetation system in present‐day climate

Withdrawal of the south‐west monsoon over India — A synoptic and climatological study

Interannual variability of onset of the summer monsoon over India and its prediction

Contact Info

Product

Resources

About