Future projections of heat waves over India from CMIP5 models
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Past studies using observational data suggested an increase in day time temperatures and frequency and duration of heat waves over India during the pre-monsoon season (April–June). In this study, the characteristics (frequency and duration) of heat waves over India in future warming scenario has been examined using nine CMIP5 models. The RCP4.5 scenario and the period 2020–2064 were used for the analysis to examine the possible changes in the characteristics of heat waves. In spite of moderate biases in day time temperatures, the CMIP5 models showed modest skill in realistic simulation of observed heat waves in terms of spatial pattern and frequency. The models suggest an increase of about two heat waves and increase of 12–18 days in heat wave duration during the period 2020–2064. In the future climate change scenario, southern parts of India and coastal part of India which are presently unaffected by heat waves, are likely to be affected by heat waves. The spatial trend analysis of Heat Wave frequency (HWF) and Heat wave Duration (HWD) suggested that both the HWF and HWD will increase significantly over central and northwest India by 0.5 events per decade and 4–7 days per decade respectively. The study also suggests that the future increase in heat waves is caused due to strengthening of mid-tropospheric high and associated subsidence over central and northwest India. Land surface processes like depletion of soil moisture and increased sensible heat fluxes are also responsible for the increase in heat waves. The CMIP5 models also suggest that El Nino Modoki events may be responsible for the prolonged and more frequent future heat waves over India in the future climate scenario.
KeywordsHeat wave CMIP5 Geopotential height Land surface processes El Nino
We would like to acknowledge the World Climate Research Programme’s Working Group on Coupled Modelling, which is responsible for CMIP5, and we thank the climate modeling groups (listed in Table 1 of this paper) for sharing their model output. We are thankful to the India Meteorological Department (IMD) for supplying the high resolution gridded temperature data for our analysis. Authors are also thankful to the Editor and two anonymous reviewers for their critical comments and suggestions which helped to improve the quality of paper. PR acknowledges the support and INSPIRE fellowship grant given by DST, Government of India. PR is thankful to Savitribai Phule Pune University for the Ph.D. admission.PR would like to acknowledge Dr. Preethi Bhaskar, IITM for her timely help. Also PR gratefully acknowledges Dr. Andrew G. Turner, University of reading for his valuable suggestions.
- Coumou D, Robinson A (2013) Historic and future increase in the global land area affected by monthly heat extremes. Environ Res Lett. https://doi.org/10.1088/1748-9326/1088/1083/034018 Google Scholar
- De US, Mukhopadhyay RK (1998) Severe heat wave over Indian subcontinent in 1998 in a perspective of global climate. Curr Sci 75(12):1308–1311Google Scholar
- De US, Dube RK, Prakasa Rao GS (2005) Extreme weather events over India in the last 100 years. J Indian Geophys Union 9(3):173–187Google Scholar
- India Meteorological Department (IMD) (2016) Annual climate summary 2016: National Climate Centre, IMD, Pune. http://rcc.imdpune.gov.in/Annual_Climate_Summary/annual_summary_2016.pdf
- Intergovernmental Panel on Climate Change (2012) Managing the risks of extreme events and disasters to advance climate change adaptation. In: Field CB, Barros V, Stocker TF, Qin D, Dokken DJ, Ebi KL, Mastrandrea MD, Mach KJ, Plattner G-K, Allen SK, Tignor M, Midgley PM (eds) A special report of working groups I and II of the intergovernmental panel on climate change. Cambridge University Press, Cambridge, UK, and New York, NY, USA, p 582Google Scholar
- Intergovernmental Panel on Climate Change (IPCC) (2014) Climate change 2014 synthesis report. In: Core Writing Team, Pachauri RK, Meyer LA (eds) Contribution of working groups I, II and III to the fifth assessment report of the Intergovernmental Panel on Climate Change. IPCC, Geneva, Switzerland, p 151Google Scholar
- Kunkel KE, Pielke RA, Changnon SA (1999) Temporal fluctuations in weather and climate extremes that cause economic and human health impacts: a review. Bull Am Meteorol Soc 80:1077–1098. https://doi.org/10.1175/1520-0477(1999)080%3C1077:TFIWAC%3E2.0.CO;2 CrossRefGoogle Scholar
- Pai DS, Nair SA, Ramanathan AN (2013) Long term climatology and trends of heat waves over India during the recent 50 years (1961–2010). Mausam 64(4):585–604Google Scholar
- Roxy M, Kapoor R, Terray P, Murtugudde R, Ashok K, Goswami BN (2015) Drying of Indian sub-continent by rapid Indian Ocean warming and a weakening land-sea thermal gradient. Nat Commun 6(7423):1–10Google Scholar
- Russo S, Dosio A, Graversen RG, Sillmann J, Carrao H, Dunbar MB, Singleton A, Montagna P, Barbola P, Vogt JV (2014) Magnitude of extreme heat waves in present climate and their projection in a warming world. J Geophys Res Atmos 119(22):12500–12512. https://doi.org/10.1002/2014JD022098 CrossRefGoogle Scholar
- Trenberth KE et al (2007) Observations: surface and atmospheric climate change. Climate change 2007. In: Solomon S et al (eds) The physical science basis. Cambridge University Press, Cambridge, pp 235–336Google Scholar