FUTURE PROJECTIONS OF PRECIPITATION CHARACTERISTICS IN ASIA

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1 FUTURE PROJECTIONS OF PRECIPITATION CHARACTERISTICS IN ASIA AKIO KITOH, MASAHIRO HOSAKA, YUKIMASA ADACHI, KENJI KAMIGUCHI Meteorological Research Institute Tsukuba, Ibaraki , Japan It is anticipated that global warming will result in large changes in Asian climate, including changes in the monsoon intensity and duration in South Asia, Southeast Asia and East Asia, and even in ENSO-monsoon relationship. Using the daily precipitation output of global climate model simulations under the SRES A2 and B2 scenarios, projected changes in precipitation characteristics around mid-21st century and end-ofthe-century are analyzed. It is found that both the frequency and intensity increase in about 40% of the globe, while both the frequency and intensity decrease in about 20% of the globe. Over the rest of the globe (about one third), the precipitation frequency decreases but its intensity increases, suggesting a shift of precipitation distribution toward more intense events by global warming. East Asia is a region where summertime wet-day frequency decreased but precipitation intensity increased. This is related to increased atmospheric moisture content due to global warming and an El Nino-like mean SST change and associated circulation changes, i.e. a strengthened subtropical high. MODEL AND EXPERIMENT We conducted the history simulation during with observed atmospheric greenhouse gas concentrations and aerosols (history run) and then future projections up to 2100 under the SRES A2 and B2 scenarios (IPCC [1]). The model used is the MRI coupled ocean-atmosphere GCM (MRI-CGCM2, Yukimoto et al. [2]). The atmospheric part of the model has a horizontal resolution of T42 (about 280km) and 30 vertical levels. The oceanic part adopted variable resolution for latitudinal direction with finer grid in the tropics and fixed 2.5 for longitudinal direction. The model performance in simulating Asian summer monsoon is found in Rajendran et al. [3]. Three ensemble runs were performed for each scenario from different initial conditions. Daily precipitation output was analyzed. RESULTS In this report, we compare 3 ensemble averages of the mid-21st century 20 yr ( ) simulations and the end of the 21tst century ( ) under the SRES-A2 and B2 scenarios with 3 ensemble averages of the present ( ) simulations. Figure 1 shows the time series of the annual and global mean surface air temperature and precipitation of the history run and the A2 and B2 scenario runs. The annual mean temperature indicates a strong warming trend particularly towards late 21st century in the 1

2 SRES-A2 scenario to attain a warming of 2.19 o C at 2100 compared to the present. In the SRES-B2 scenario the warming is less (1.40 o C). At the mid-21st century, the difference in the warming is small between A2 (0.84 o C) and B2 (0.72 o C). Changes in the annual mean precipitation show an increase of 4.54% in SRES-A2 scenario, while 2.48% in the B2 scenario. Again the difference between A2 and B2 scenarios is negligible until mid- 21st century (1.41% and 1.57%, respectively). 2 Figure 1. Time series of annual and global mean (a) surface air temperature and (b) precipitation of the history and the SRES-A2 and B2 scenario runs Figure 2 shows the change in annual mean surface air temperature at and for both A2 and B2 scenarios. Strong warming is evident in high latitudes at the end of the 21st century in SRES-A2 scenario. However its spatial pattern is similar to each other, with the higher latitudes being warmer than the lower latitudes, and the land surface warmer than over the oceans. It is noted that over the tropical Pacific the eastern part warms up more than the western part, suggesting a permanent El Nino-like SST change by global warming. Figure 3 shows the change in annual mean total precipitation at and for both A2 and B2 scenarios. In the tropics, an eastward displacement of major precipitation center is noted associated with El Nino-like background mean SST changes (not shown). In Asia annual mean precipitation increased in both scenarios and both time times. Increased rainfall in the South Asian summer monsoon is noted. In higher latitudes total precipitation increased, while there is a decrease in precipitation over the subtropical oceans and the Mediterranean region.

3 3 Figure 2. Annual mean surface air temperature difference (F P) at (a) for A2, (b) for B2, (c) for A2, and (d) for B2. Figure 3. As in Fig.2 except for total precipitation.

4 4 Figure 4. As in Fig. 2 except for rainy-day frequency. Figure 5. As in Fig. 2 except for precipitation intensity in rainy day.

5 5 Figure 6. Changes in three characteristics in precipitation based on total precipitation (T), wet-day frequency (F) and precipitation intensity of wet-day (I). Classification of types 1-8 are + + +, ++, + +, +, + +, +, + and for T F I, respectively. Figure 4 shows the changes in annual rainy-day frequency. Here we defined the day as rainy when daily precipitation exceeding 1.0 mm/d. An overall spatial pattern is similar to that in total precipitation, but relatively large changes in frequency can be found in the middle and high latitudes. Also the areal extent of negative changes in wetday frequency is larger than that in total precipitation Figure 5 shows the changes in the intensity of precipitation in rainy days. An overall pattern is again similar to Figs. 3 and 4 in the tropics and high latitudes. However, in the mid-latitudes, there are regions with different signs between intensity and frequency. For example, over the Mediterranean region, the frequency change is negative while the intensity change is positive. If areal extent of positive or negative changes is compared, total precipitation has increased over about 65% of the globe at in the SRES-A2 scenario (Fig. 3c). It is 42% of the globe where wet-day frequency has increased, while it is 79% where the intensity of precipitation in rainy days has increased. These numbers differ only a few percent from decades to decades and between A2 and B2 scenarios.

6 In order to investigate the relationship among the three characteristics we classified each grid point into 8 categories. Figure 6 shows the changes in three characteristics in precipitation based on total precipitation, wet-day frequency and wet-day precipitation intensity. Table 1 shows the ratio of area each type. It is shown that both the frequency and intensity increased in about 40% of the globe (type 1), while both the frequency and intensity decreased in about 20% of the globe (type 8). In between, which occupies around one third of the globe, the precipitation frequency decreased but its intensity increased (type 3 or 7). Existence of types 3 and 7 suggests a shift toward more intense precipitation events by global warming. Moreover, the ratio of types 3 and 7 becomes larger from the SRES-B2 scenario to the SRES-A2 scenario, and also from the period of to the period , corresponding the magnitude of the warming. Table 1. Relative area ratio (% of the globe) of 8 classifications for the middle ( ) and the end ( ) of the 21st century for the SRES-A2 and B2 scenario runs. Types 2, 4, 5 and 6 are grouped. Total Freq Intens A2/41-60 A2/81-00 B2/41-60 B2/81-00 Type Type Type Type Others The Mediterranean and the Middle East is the type 7 region where both total precipitation and number of rainy days decreased but precipitation intensity itself increased. It is interesting to note that the observed rainfall over the Mediterranean showed an increase of extreme rainfall in spite of decrease in total precipitation (e.g., Alpert et al. [4]). The East Asia and the Southeast Asia are the type 3 regions and may be regarded as a more flood vulnerable region in the future. Figure 7 compares the seasonal changes of the total precipitation, wet-day frequency and precipitation intensity averaged for South China (100 o E 120 o E, 26 o N 33 o N) between the present and the period for the SRES-A2 scenario run. The SRES-A2 scenario shows increase total precipitation in early rainy season of March May, while wet-day frequency decreased in mid-summer season of May August. However the precipitation intensity has increased almost all the year round. Figure 8 shows the June-August (JJA) total moisture flux and its convergence in the model control climate and its changes in of the SRES-A2 scenario. There is a moisture flux convergence over the wide area in Asia. Increased atmospheric moisture content in the warmer air in the scenario run leads to larger moisture flux and increased

7 precipitation (e.g., Kitoh et al. [5]). It is also noted that the Pacific subtropical anticyclone becomes stronger and more southerly moisture flux converges over South China. It is plausible that wet-day frequency decreases due to a westward shift and an intensification of the subtropical anticyclone while larger moisture flux results in more intense precipitation. Moisture flux convergence is also larger over Japan, suggesting more intense Baiu activity in this region. These circulation anomalies are often observed at times of El Nino events, and thus the simulated El Nino-like mean climate response in the tropical Pacific (Fig. 2) may be related to these changes in Asia. 7 Figure 7. Seasonal changes of (a) total precipitation, (b) wet-day frequency and (c) precipitation intensity for South China (100 o E 120 o E, 26 o N 33 o N). Solid line denotes present and dashed line denotes for the SRES-A2 scenario run. Box is plotted at abscissa where the difference between future and present is statistically significant based on 3 ensemble members where black (dark) color denotes future is larger (smaller) than present. Figure 8. (a) Total moisture flux and its divergence in JJA in the control run. Shaded area denotes moisture flux convergence, (b) Changes in total moisture flux and its divergence in JJA for the period of the SRES-A2 scenario run.

8 8 SUMMARY The daily precipitation data produced by the MRI-CGCM ensemble runs under the SRES A and SRES-B2 scenarios are analyzed. In the tropics, eastward displacement of precipitation was noted associated with El Nino-like mean SST changes. From the analysis of precipitation characteristics, it is found that over one third of the globe, number of rainy days decreased but precipitation intensity has increased. Areal extent of such a region will increase towards the end of the 21st century by global warming. ACKNOWLEDGMENTS This research was partly funded by "Study of the Prediction of Regional Climate Changes over Japan due to Global Warming" of JMA and by "Water Resource and Its Variability in Asia in the 21st Century" of "Special Coordination Funds for Promoting Science and Technology" of MEXT. REFERENCES [1] IPCC, "Climate Change 2001: The Scientific Basis. Contribution of Working Group I to the Third Assessment Report of the Intergovernmental Panel on Climate Change", Houghton JT et al. (eds.), Cambridge University Press, (2001). [2] Yukimoto S., and Coauthors, "The new Meteorological Research Institute coupled GCM (MRI-CGCM2) - Model climate and variability", Pap. Meteor. Geophys., Vol. 51, (2001), pp [3] Rajendran K., Kitoh A. and Yukimoto S., "South and east Asian summer monsoon climate and variation in the MRI coupled model (MRI-CGCM2)", J. Climate, Vol. 17, (2004), pp [4] Alpert P., and Coauthors, "The paradoxical increase of Mediterranean extreme daily rainfall in spite of decrease in total values", Geophys. Res. Lett., Vol. 29, No. 11, (2002), /2001GL [5] Kitoh A., Yukimoto S., Noda A. and Motoi T., "Simulated changes in the Asian summer monsoon at times of increased atmospheric CO 2 ", J. Meteor. Soc. Japan, Vol. 75, No. 6, (1997), pp

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