{"id":261467,"date":"2023-06-10T15:06:25","date_gmt":"2023-06-10T13:06:25","guid":{"rendered":"https:\/\/climatescience.press\/?p=261467"},"modified":"2023-06-10T15:06:27","modified_gmt":"2023-06-10T13:06:27","slug":"predicting-the-indian-sw-monsoon","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=261467","title":{"rendered":"Predicting the Indian SW Monsoon"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

<\/p>\n\n\n\n

From Watts Up With That?<\/a><\/p>\n\n\n\n

By Dr. M M Ali \u2014 June 7 2023<\/p>\n\n\n\n

Why we should observe the ocean to better predict the atmosphere?<\/strong><\/p>\n\n\n

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I may be embroiled in controversy with the monsoon professionals and modelers by writing this article.  However, I would like to trespass and put forth some of my ideas in meeting the challenges to predicting the mysterious Indian southwest monsoon<\/a> rainfall by including ocean observations.<\/p>\n\n\n\n

Monsoon rains in India are mystical and erratic, either with too little water causing drought or far too much flooding! Even worse, extreme rainfall events have been very common in recent years with the number of days with heavy rains increasing and longer dry spells stretching out in between. As a result, normal and steady rains that can reliably penetrate the soil are decreasing. Adding to this, increasing deforestation and urbanization continuously reduce the infiltration capacity of the soil. As a result, groundwater is withdrawn faster than rain can recharge it. This is an alarming situation for a country like India, which gets the maximum share of its water through the rain. In addition, [it is claimed \u2013 kh] climate change is now messing with the monsoon, making seasonal rains more intense and less predictable.<\/p>\n\n\n

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\u00adAdding to these problems is the predictability or the unpredictability of the monsoon rainfall!<\/p>\n\n\n\n

A monsoon is a seasonal reversal in the prevailing wind direction, that is usually initiated by the land sea temperature contrast.  The Indian summer monsoon, for example, is triggered when the land gets heated up more than the surrounding sea during the summer creating a pressure gradient between the land and the sea (Figure 1).  <\/p>\n\n\n

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Figure 1: Climatology of the southwest monsoon circulation during Indian summer (Source: http:\/\/www.meteo.co.in\/Monsoons\/image004.jpg<\/a>).<\/p>\n\n\n\n

While efforts are underway to improve the understanding of the physics of the problem of monsoon rainfall prediction, it is worthwhile to look again at the efficiency of the input parameters presently used in models and to look for new approaches. Sea surface temperature (SST) is one such parameter that needs to be reconsidered for predicting the Indian summer monsoon rainfall (ISMR). SST is routinely used for predicting the weather phenomena such as monsoons or cyclones, while it is well established that the thermal energy required for atmospheric phenomena comes from the upper ocean, not from the thin layer of the ocean sometimes reflected in SST alone.  SST is restricted to a few millimeters of the top ocean layer, particularly when it is estimated from the satellites and is largely influenced by strong winds, evaporation, or thick clouds. Hence, it does not reflect the thermal energy available in the upper ocean.   Rapid (of the order of a day to a month) heating (such as strong solar heating) and cooling (such as more evaporation due to strong winds and\/or clouds) events can quickly erase the thermal signature of subsurface warm or cold features (Pickard and Emery 1990<\/a>), leading to SST misrepresenting the ocean thermal energy.  In contrast, ocean mean temperature (OMT), which is measured up to a depth of 26o<\/sup> C isotherm or up to a fixed depth, is more stable and consistent, the spatial spread of which is also less compared to SST. This is even evident from the average coefficient of variation, defined as the relative magnitude of the standard deviation to the average (1993\u20132017) value (Figure 2) for monthly SST (0.02) being double that for OMT (0.01) for the North Indian Ocean. <\/p>\n\n\n\n

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 Figure 2: Coefficient of variation of SST (a) and OMT (b) during 1993\u20132017. The rectangle represents the south Indian ocean area that has a major influence in ISMR.  (courtesy: Venugopal et al. 2017).<\/p>\n\n\n\n

The application of ocean thermal energy for cyclone studies was already demonstrated through several studies. For example, Mao et al. 2000<\/a> reported that the rate of intensification and final intensity of cyclones are sensitive to the initial spatial distribution of the mixed layer, a proxy for ocean thermal energy, rather than to SST alone. Similarly, Shay et al. (2000), Ali et al. (2007), Mainelli et al. (2008), Ali et al. (2013) and Lin et al. (2013) and Jaimes and Shay, (2015) demonstrated\/suggested the importance of ocean thermal energy for cyclone studies.<\/p>\n\n\n\n

Similarly, the role of the heat energy available in the sub-surface ocean layers in El Nino studies was confirmed by Smith et al. (1995), Ji et al. (1997) and Latif et al. (1998). They proved that even the El Ni\u00f1o forecast models could be improved by initializing the models with the observed ocean heat content (OHC). OHC is the amount of thermal energy available in the oceans from surface to a fixed depth, say, 100m or 200m given by equation (1).<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

where \u03c1 is the density of the sea water, Cp is the specific heat capacity of the seawater at constant pressure, p; h1<\/sub> the top depth, h2<\/sub> the bottom depth, dz the thickness of the layer and T is the average temperature of the layer in o<\/sup>C. Although in situ<\/em> temperature profiles are required to estimate this parameter, it can be indirectly inferred from the satellite-derived sea surface height anomaly (SSHA) and SST.<\/p>\n\n\n\n

Based on this concept, Venugopal et al. (2018)<\/a> analysed 25 years of OMT (ocean mean temperature) of the north Indian Ocean (NIO) from 1993 to 2017 spanning 30\u00b0S to 30\u00b0N and 40\u00b0E to 100\u00b0E, with a grid spacing of 0.25\u00b0 \u00d7 0.25\u00b0. They computed OMT from the Tropical Cyclone Heat Potential (TCHP) and the depth of 260 <\/sup>C (D26<\/sub>) obtained from the National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratory (ftp.aoml.noaa.gov<\/a>). The 26 degree C isotherm is seen at depths varying from 50\u2013100 meters. During January\u2013March, the mean 26 degree C isotherm depth in the Southwestern Equatorial Indian Ocean (SEIO), the rectangular area shown in figure 2 is 59 meters.  The researchers analysed 25-year OMT data from 1993 to 2017. They found that unlike SST, OMT of SEIO was able to correctly predict 20 out of 25 years (80% success rate) whether the amount of rainfall during the summer monsoon was more or less than the long-term mean, 887.5 mm. The prediction based solely on sea surface temperature was correct only for 15 out of 25 years (with a 60% success rate). Using this approach the monsoon was predicted to be more than the average during 2018-2022 with an 80% success rate.<\/p>\n\n\n\n

In addition to better predictive score, the information on whether the amount of monsoon rainfall will be more or less than the long-term mean will be available by the beginning of April, two months before the southwest monsoon sets in. This is because OMT is analysed by measuring the ocean thermal energy during the period from January to March and the southwest monsoon sets in around June 1 each year in Kerala<\/a> .<\/p>\n\n\n\n

Out of the 10 years of observed rainfall, there are 6  below average and 4 above average rainfall years during 2013-2022 (Figure 3).  The all-India monsoon rainfall in 2014, 2015, 2016, 2017, 2018, and 2021 was below average<\/em> during June\u2013September but above average<\/em> in 2013, 2019, 2020, and 2022.  Except in 2016, all the years were predicted correctly using OMT estimated during January-March.  Venugopal et al. (2018) claimed an accuracy of 80% for their 25 years study.    Since the predictions during 2018-2022  were also correct, the success rate has now increased from 80% to 83.3%. <\/p>\n\n\n\n

With this success rate, our prediction for the all-India June-September 2023 is that total rainfall is likely to be less than 887.5 mm.  We have to wait and watch what happens!<\/p>\n\n\n\n

# # # # #<\/strong><\/p>\n\n\n\n

List of references:<\/u><\/strong><\/p>\n\n\n\n

Ali, M. M., P. S. V. Jagadeesh and S. Jain, Effects of eddies on Bay of Bengal cyclone intensity. Eos, Transactions American Geophysical Union <\/em>88(8)<\/strong>: 93\u201395 (2007).<\/p>\n\n\n\n

Ali, M. M., T. Kashyap and P. V. Nagamani, Use of sea surface temperature for cyclone intensity prediction needs a Relook. Eos, Transactions American Geophysical Union <\/em>94<\/strong>, 177\u2013178 (2013).<\/p>\n\n\n\n

Jaimes, B. and L.K. Shay, Enhanced wind-driven downwelling flow in warm oceanic eddy features during the intensification of tropical cyclone Isaac (2012): Observations and theory. J. Phys. Oceanogr. 45, 1667\u20131689. https:\/\/doi.org\/10.1175\/JPO-D-14-0176.1<\/a> (2015).<\/p>\n\n\n\n

Ji, M. and A. Leetmaa, Impact of data assimilation on ocean initialization and El Nino prediction. Monthly Weather Review <\/em>125(5)<\/strong>, 742\u2013753 (1997).<\/p>\n\n\n\n

Latif, M., D. Anderson, T. Barnett, M. Cane, R. Kleeman and A. Leetmaa, E. Schneider, A review of the predictability and prediction of ENSO. Journal of Geophysical Research: Oceans <\/em>103(C7)<\/strong>, 14375\u201314393 (1998).<\/p>\n\n\n\n

Lin, I. I., G. J. Goni, J. A. Knaff, C. Forbes and M. M. Ali, Ocean heat content for tropical cyclone intensity forecasting and its impact on storm surge. Natural Hazards 66<\/strong><\/em>(3)<\/strong>, 1481\u20131500 (2013).<\/p>\n\n\n\n

Mainelli, M., M. DeMaria, L. K. Shay and G. J. Goni, Application of oceanic heat content estimation to operational forecasting of recent Atlantic category 5 hurricanes. Weather and Forecasting 23<\/strong><\/em>(1)<\/strong>, 3\u201316 (2008).<\/p>\n\n\n\n

Mao, Q., S. W. Chang and R. L. Pfeffer, Influence of large- scale initial oceanic mixed layer depth on tropical cyclones, Mon. Weather Rev. 128<\/strong>, <\/em>4058\u20134070 (2000).<\/p>\n\n\n\n

Pickard, G. L. and W. J. Emery, Descriptive physical oceanography: An introduction. Elsevier <\/em>(1990).<\/p>\n\n\n\n

Shay, L. K., G. J. Goni and P. G. Black, Effects of a warm oceanic feature on Hurricane Opal, Mon.Weather Rev. 128<\/strong>, <\/em>1366\u20131383 (2000).<\/p>\n\n\n\n

Smith, T. M., A. G. Barnston, M. Ji and M. Chelliah, The impact of Pacific Ocean subsurface data on operational prediction of tropical Pacific SST at the NCEP. Weather and forecasting <\/em>10(4)<\/strong>, 708\u2013714 (1995).<\/p>\n\n\n\n

# # # # #<\/strong><\/p>\n\n\n\n

About the Author:<\/u><\/strong><\/p>\n\n\n\n

Dr. M M Ali<\/a> is an Indian meteorologist and author\/co-author of many peer-reviewed studies<\/a> on the relationships between the oceans and the atmosphere. He is currently a Senior Scientist (courtesy) at the Center for Ocean-Atmospheric Prediction Studies, Florida State University<\/a> (2015 to present). <\/p>\n\n\n\n

He is a co-author, with Venugopal Thandlam<\/a> (as lead author) and others, of  \u201cStatistical Evidence for the Role of Southwestern Indian Ocean Heat Content in the Indian Summer Monsoon Rainfall<\/a>\u201d.   T. Venugopal computed the values for 2018-2023.<\/p>\n\n\n\n

Dr. Ali wrote this piece for WUWT after reading \u201cThe Southwest Monsoon \u2014 More Erratic?<\/a>\u201d.<\/p>\n\n\n\n

This essay has been lightly edited by Kip Hansen ( any editing errors are mine \u2013 kh )<\/p>\n\n\n\n

# # # # #<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Why we should observe the ocean to better predict the atmosphere?<\/p>\n","protected":false},"author":121246920,"featured_media":261476,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_crdt_document":"","advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[691818522,691820090,691818237,691820088,691820089],"class_list":{"0":"post-261467","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-uncategorized","8":"tag-atmosphere","9":"tag-cyclone","10":"tag-india","11":"tag-indian-summer-monsoon","12":"tag-sea-surface-temperature","14":"fallback-thumbnail"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/06\/0-Southwest-monsoon.jpg?fit=1280%2C720&ssl=1","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-161d","jetpack-related-posts":[{"id":232135,"url":"https:\/\/climatescience.press\/?p=232135","url_meta":{"origin":261467,"position":0},"title":"Pacific problems for climate models","author":"uwe.roland.gross","date":"02\/12\/2022","format":false,"excerpt":"What this research points to is a failing of climate models in this vital region indicating a huge source of uncertainty in multi-decadal projections of regional and global climate.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/12\/image-31.png?fit=1094%2C712&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/12\/image-31.png?fit=1094%2C712&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/12\/image-31.png?fit=1094%2C712&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/12\/image-31.png?fit=1094%2C712&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2022\/12\/image-31.png?fit=1094%2C712&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":339497,"url":"https:\/\/climatescience.press\/?p=339497","url_meta":{"origin":261467,"position":1},"title":"NOAA Criteria Suggest Full-Fledged La Ni\u00f1a Unlikely in 2024 \u2013 Even A Single La Ni\u00f1a Threshold Unlikely During the Indian Southwest Monsoon","author":"uwe.roland.gross","date":"13\/08\/2024","format":false,"excerpt":"Concluding from the above analysis, Enso Neutral conditions will prevail for JJA2024 and at the end of August, since only four months will be left in the current year 2024 full-fledged La Nina cannot be established, even if La Nina thresh hold is achieved in any of the four months\u2026","rel":"","context":"In \"Climate Prediction Center (CPC)\"","block_context":{"text":"Climate Prediction Center (CPC)","link":"https:\/\/climatescience.press\/?tag=climate-prediction-center-cpc"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/08\/0-La-Nina.jpeg?fit=1200%2C806&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/08\/0-La-Nina.jpeg?fit=1200%2C806&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/08\/0-La-Nina.jpeg?fit=1200%2C806&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/08\/0-La-Nina.jpeg?fit=1200%2C806&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2024\/08\/0-La-Nina.jpeg?fit=1200%2C806&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":301633,"url":"https:\/\/climatescience.press\/?p=301633","url_meta":{"origin":261467,"position":2},"title":"Strong El Nino Conditions Prevails at The End of January 2024","author":"uwe.roland.gross","date":"13\/02\/2024","format":false,"excerpt":"The classification of El Ni\u00f1o events, including the strength labels, is somewhat subjective and can vary among meteorological and climate agencies. 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This is false. 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