IJG  Vol.2 No.4 , November 2011
Role of Turbulent Heat Fluxes over Land in the Monsoon over East Asia
Abstract: Atmospheric heat and moisture over land are fundamental drivers of monsoon circulations. However, these drivers are less frequently considered in explaining the development and overall intensity of monsoons than heat and moisture over the ocean. In this study, the roles of turbulent heat fluxes over land in the monsoon system over East Asia are examined using Climatic Research Unit observations and European Centre for Medium-Range Weather Forecasts reanalysis, and they are further explored using simulated sensible (H) and latent (LE) heat fluxes from an ecosystem model (Predicting Ecosystem Goods and Services Using Scenarios or PEGASUS). Changes in the H fluxes over the land during the pre-monsoon season (March-May: MAM) affect the differential heating between land and ocean, which in turn controls monsoon development. In July, an intensified contrast of the mean sea level pressure between land and ocean is observed during the years of stronger land-sea H contrast in MAM, which results in enhanced onshore flows and more rainfall over southern East Asia. After monsoon onset, the contrast of H is influenced by monsoon rainfall through the cooling effect of precipitation on surface air temperature. During the monsoon season (June-September: JJAS), LE fluxes are more important than H fluxes, since LE fluxes over land and ocean affect overall monsoon intensity through changes in the land-sea contrast of turbulent heat fluxes. Significantly increased monsoon rainfall over western East Asia is observed during the years of larger LE over the land in JJAS. In ecosystem modeling, we find that the monsoon can be weakened as potential (natural) vegetation is converted to bare ground or irrigated cropland. Simulated H fluxes in MAM and LE fluxes in JJAS over the land significantly decrease in irrigated crop and bare ground scenarios, respectively, which play crucial roles in controlling monsoon development and overall intensity.
Cite this paper: nullE. Lee, C. Barford, C. Kucharik, B. Felzer and J. Foley, "Role of Turbulent Heat Fluxes over Land in the Monsoon over East Asia," International Journal of Geosciences, Vol. 2 No. 4, 2011, pp. 420-431. doi: 10.4236/ijg.2011.24046.

[1]   E. A. B. Eltahir and C. Gong, “Dynamics of Wet and Dry Years in West Africa,” Journal of Climate, Vol. 9, No. 5, 1996, pp. 1030-1042. doi:10.1175/1520-0442(1996)009<1030:DOWADY>2.0.CO;2

[2]   K. K. Kumar, B. Rajagopalan, M. Hoerling, G. Bates and M. Cane, “Unraveling the Mystery of Indian Monsoon Failure during El Ni?o,” Science, Vol. 314, No. 5796, 2006, pp. 115-119. doi:10.1126/science.1131152

[3]   K. Takata, K. Saitoa and T. Yasunari, “Changes in the Asian Monsoon Climate during 1700-1850 Induced by Preindustrial Cultivation,” Proceedings of the National Academy of Sciences, Vol. 106, No. 24, 2009, pp. 9586- 9589. doi:10.1073/pnas.0807346106

[4]   P. J. Webster, et al., “Monsoons: Processes, Predictability, and the Prospects for Prediction,” Journal of Geophysical Research, Vol. 103, No. C7, 1998, pp. 14451-14510. doi:10.1029/97JC02719

[5]   K. K. Kumar, B. Rajagopalan and M. Cane, “On the Weakening Relationship between the Indian Monsoon and ENSO,” Science, Vol. 284, No. 5423, 1999, pp. 2156-2159. doi:10.1126/science.284.5423.2156

[6]   B. Wang, R. Wu and X. Fu, “Pacific-East Asian Teleconnection: How Does ENSO Affect East Asian Climate?” Journal of Climate, Vol. 13, No. 9, 2000, pp. 1517-1536. doi:10.1175/1520-0442(2000)013<1517:PEATHD>2.0.CO;2

[7]   T. M. Shanahan, et al., “Atlantic Forcing of Persistent Drought in West Africa,” Science, Vol. 324, No. 5925, 2009, pp. 377-380. doi:10.1126/science.1166352

[8]   X. Zheng, E. A. B. Eltahir and K. A. Emanuel, “A Mechanism Relating Tropical Atlantic Spring Sea Surface Temperature and West African Rainfall,” Quarterly Journal of the Royal Meteorological Society, Vol. 125, 1999, pp. 1129-1163.

[9]   G. B. Pant and B. Parthasarathy, “Some Aspects of an Association between the Southern Oscillation and Indian Summer Monsoon,” Meteorology and Atmospheric Physics, Vol. 29, 1981, pp. 245-252.

[10]   C.-P. Chang, Y. Zhang and T. Li, “Interannual and Interdecadal Variations of the East Asian Summer Monsoon and Tropical Pacific SSTs. Part I: Roles of the Subtropical Ridge,” Journal of Climate, Vol. 13, No. 24, 2000, pp. 4310-4325. doi:10.1175/1520-0442(2000)013<4310:IAIVOT>2.0.CO;2

[11]   E. Lee, T. N. Chase, P. J. Lawrence and B. Rajagopalan, “Model Assessment of the Observed Relationship between El Ni?o and the Northern East Asian Summer Monsoon Using CAM-CLM3,” Journal of Geophysical Research, Vol. 113, 2008, D20118. doi:10.1029/2008JD009926

[12]   E. M. Rasmusson and T. H. Carpenter, “The Relationship between Eastern Equatorial Pacific Sea Surface Temperatures and Rainfall over India and Sri Lanka,” Monthly Weather Review, Vol. 111, No. 3, 1983, pp. 517-528. doi:10.1175/1520-0493(1983)111<0517:TRBEEP>2.0.CO;2

[13]   J. G. Charney, “Dynamics of Deserts and Drought in Sahel,” Quarterly Journal of the Royal Meteorological Society, Vol. 101, No. 428, 1975, pp. 193-202. doi:10.1002/qj.49710142802

[14]   X. Zheng and E. A. B. Eltahir, “The Role of Vegetation in the Dynamics of West African Monsoons,” Journal of Climate, 11, No. 8, 1998, pp. 2078-2096. doi:10.1175/1520-0442-11.8.2078

[15]   G. L. Wang, E. A. B. Eltahir, J. A. Foley, D. Pollard and S. Levis, “Decadal Variability of Rainfall in the Sahel: Results from the Coupled GENESIS-IBIS Atmosphere- Biosphere Model,” Climate Dynamics, Vol. 22, No. 6-7, 2004, pp. 625-637. doi:10.1007/s00382-004-0411-3

[16]   Y. C. Sud and W. E. Smith, “Influence of Local Land- Surface Processes on the Indian Monsoon: A Numerical Study,” Journal of Climate and Applied Meteorology, Vol. 24, No. 10, 1985, pp. 1015-1036. doi:10.1175/1520-0450(1985)024<1015:IOLLSP>2.0.CO;2

[17]   G. A. Meehl, “Influence of the Land Surface in the Asian Summer Monsoon: External Condition versus Internal Feedbacks,” Journal of Climate, Vol. 7, No. 7, 1994, pp. 1033-1049. doi:10.1175/1520-0442(1994)007<1033:IOTLSI>2.0.CO;2

[18]   F. Saeed, S. Hagemann and D. Jacob, “Impact of Irrigation on the South Asian Summer Monsoon,” Geophysical Research Letters, Vol. 36, 2009, L20711. doi:10.1029/2009GL040625

[19]   C. Fu, “Potential Impacts of Human-Induced Land Cover Change on East Asia Monsoon, Global Planet,” Change, Vol. 37, 2003, pp. 219-229.

[20]   E. Lee, T. N. Chase and B. Rajagopalan, “Highly Improved Predictive Skill in the Forecasting of the East Asian Summer Monsoon,” Water Resources Research, Vol. 44, 2008, W10422. doi:10.1029/2007WR006514

[21]   E. M. Douglas, A. Beltrán-Przekurat, D. Niyogi, R. A. Pielke Sr. and C. J. V?r?smarty, “The Impact of Agricultural Intensification and Irrigation on Land–Atmosphere Interactions and Indian Monsoon Precipitation—A Me- soscale Modeling Perspective,” Global and Planetary Change, Vol. 67, No. 1-2, 2009, pp. 117-128. doi:10.1016/j.gloplacha.2008.12.007

[22]   N. Gedney and P. J. Valdes, “The Effect of Amazonian Deforestation on the Northern Hemisphere Circulation and Climate,” Geophysical Research Letters, Vol. 27, No. 19, 2000, pp. 3053-3056. doi:10.1029/2000GL011794

[23]   J. O. Adegoke, R. A. Pielke Sr., J. Eastman, R. Mahmood and K. G. Hubbard, “Impact of Irrigation on Midsummer Surface Fluxes and Temperature under Dry Synoptic Conditions: A Regional Atmospheric Model Study of the U.S. High Plains,” Monthly Weather Review, Vol. 131, No. 3, 2003, pp. 556-564. doi:10.1175/1520-0493(2003)131<0556:IOIOMS>2.0.CO;2

[24]   S. Siebert, P. D?ll, J. Hoogeveen, J. M. Faures, K. Frenken and S. Feick, “Development and Validation of the Global Map of Irrigation Areas,” Hydrology and Earth System Sciences, Vol. 9, 2005, pp. 535-547. doi:10.5194/hess-9-535-2005

[25]   N. Ramankutty, A. Evan, C. Monfreda and J. A. Foley, “Farming the Planet. Part 1: The Geographic Distribution of Global Agricultural Lands in the Year 2000,” Global Biogeochemical Cycles, Vol. 22, 2008, GB1003. doi:10.1029/2007GB002952

[26]   T. W. Biggs, C. A. Scott, A. Gaur, J.-P. Venot, T. Chase and E. Lee, “Impacts of Irrigation and Anthropogenic Aerosols on the Water Balance, Heat Fluxes, And Surface Temperature in a River Basin,” Water Resources Research, Vol. 44, 2008, W12415. doi:10.1029/2008WR006847

[27]   E. Lee, T. N. Chase, B. Rajagopalan, R. G. Barry, T. W. Biggs and P. J. Lawrence, “Effects of Irrigation and Ve- getation Activity on Early Indian Summer Monsoon Variability,” International Journal of Climatology, Vol. 29, No. 4, 2009, pp. 573-581. doi:10.1002/joc.1721

[28]   S. M. Uppala, et al., “The ERA-40 Reanalysis,” Quarterly Journal of the Royal Meteorological Society, Vol. 131, No. 612, 2005, pp. 2961-3012. doi:10.1256/qj.04.176

[29]   P. A. Dirmeyer, X. Gao, M. Zhao, Z. Guo, T. Oki and N. Hanasaki, “GSWP-2: Multimodel Analysis and Implications for Our Perception of the Land Surface,” Bulletin of the American Meteorological Society, Vol. 87, No. 10, 2006, pp. 1381-1397. doi:10.1175/BAMS-87-10-1381

[30]   L. Yu, X. Jin and R. A. Weller, “Multidecade Global Flux Datasets from the Objectively Analyzed Air-Sea Fluxes (OAFlux) Project: WHOI,” OAFlux Project Technical Report OA-2008-01, Woods Hole, 2008.

[31]   A. Boone, I. Poccard-Leclerq, Y. Xue, J. Feng and P. de Rosnay, “Evaluation of the WAMME Model Surface Fluxes Using Results from the AMMA Land-Surface Model Intercomparison Project,” Climate Dynamics, Vol. 35, No. 1, 2010, pp. 127-142. doi:10.1007/s00382-009-0653-1

[32]   T. D. Mitchell, R. C. Timothy, D. J. Philip, H. Mike and N. Mark, “A Comprehensive Set of Climate Scenarios for Europe and the Globe,” Tyndall Centre Working Paper, Vol. 55, 2004, p. 30.

[33]   P. C. West, G. T. Narisma, C. C. Barford, C. J. Kucharik and J. A. Foley, “A Simple Approach for Quantifying Climate Regulation by Ecosystems,” Frontiers in Ecology and the Environment, Vol. 9, No. 2, 2011, pp. 126- 133. doi:10.1890/090015

[34]   D. Deryng, W. J. Sacks, C. C. Barford and N. Ramankutty, “Simulating the Effects of Climate and Agricultural Management Practices on Global Crop Yield,” Global Biogeochemical Cycles, Vol. 25, 2011, GB2006. doi:10.1029/2009GB003765

[35]   H. L. Penman, “Natural Evaporation from Open Water, Bare Soil and Grass,” Proceedings of the Royal Society of London, Vol. 1032, 1948, pp. 120-145.

[36]   C. H. B. Priestley and R. J. Taylor, “On the Assessment of Surface Heat Flux and Evaporation Using Large-Scale Parameters,” Monthly Weather Review, Vol. 100, No. 2, 1972, pp. 81-92. doi:10.1175/1520-0493(1972)100<0081:OTAOSH>2.3.CO;2

[37]   N. Ramankutty, J. A. Foley, J. Norman and K. McSweeney, “The Global Distribution of Cultivable Lands: Current Patterns and Sensitivity to Possible Climate Change,” Global Ecology and Biogeography, Vol. 11, No. 5, 2002, pp. 377-392. doi:10.1046/j.1466-822x.2002.00294.x

[38]   D. Gerten, S. Schaphoff, U. Haberlandt, W. Lucht and S. Sitch, “Terrestrial Vegetation and Water Balance—Hy- drological Evaluation of a Dynamic Global Vegetation Model,” Journal of Hydrology, Vol. 286, No. 1-4, 2004, pp. 249-270. doi:10.1016/j.jhydrol.2003.09.029

[39]   M. New, D. Lister, M. Hulme and I. Makin, “A High- Resolution Data Set of Surface Climate over Global land Areas,” Climate Research, Vol. 21, No. 1, 2002, pp. 1-25. doi:10.3354/cr021001

[40]   P. K. Snyder, C. L. Delire and J. A. Foley, “Evaluating the Influence of Different Vegetation Biomes on the Global Climate,” Climate Dynamics, Vol. 23, No. 3-4, 2004, pp. 279-302. doi:10.1007/s00382-004-0430-0

[41]   K. L. Findell, E. Shevliakova, P. C. D. Milly and R. J. Stouffer, “Modeled Impact of Anthropogenic Land Cover Change on Climate,” Journal of Climate, Vol. 20, No. 14, 2007, pp. 3621-3634. doi:10.1175/JCLI4185.1

[42]   M. Ozdogan, M. Rodell, H. K. Beaudoing and D. L. Toll, “Simulating the Effects of Irrigation over the U.S. in a Land Surface Model Based on Satellite Derived Agricultural Data,” Journal of Hydrometeorology, Vol. 11, No. 1, 2010, pp. 171-184. doi:10.1175/2009JHM1116.1

[43]   W. J. Sacks, B. I. Cook, N. Buenning, S. Levis and J. H. Helkowski, “Effects of Global Irrigation on the Near-Surface Climate,” Climate Dynamics, Vol. 33, No. 2-3, 2009, pp. 159-175. doi:10.1007/s00382-008-0445-z

[44]   J. H. Helkowski, “Global Patterns of Soil Moisture and Runoff: An Assessment of Water Availability,” M.S. Thesis, University of Wisconsin-Madison, Madison, 2004.

[45]   N. Saigusa, S. Yamamoto, S. Murayama, H. Kondo and N. Nishimura, “Gross Primary Production and Net Ecosystem Exchange of a Cool-Temperate Deciduous Forest Estimated by the Eddy Covariance Method,” Agricultural and Forest Meteorology, Vol. 112, No. 3-4, 2002, pp. 203-215. doi:10.1016/S0168-1923(02)00082-5

[46]   G. Bonan, “Ecological Climatology,” Cambridge University Press, Cambridge, 2008.

[47]   T. Yasunari, “Land-Atmosphere Interaction,” In B. Wang, Ed., The Asian Monsoon, Springer, Berlin, 2006. doi:10.1007/3-540-37722-0_11