17:15 〜 19:15
[ACG45-P04] AsiaPEX strategies for the field campaign: Discussion toward the Asian Monsoon Year-II
キーワード：Asian hydroclimatological system、field campaign、land-atmosphere coupling、S2S predictability
AsiaPEX (Asian Precipitation Experiment) was launched in 2019 as a successor of past Asian Hydroclimatological Projects under GEWEX, GAME (1995-2006) and MAHASRI (2006-2016). The objective of the AsiaPEX is to enhance our understanding of terrestrial precipitation over diverse hydroclimatological conditions for improved predictions, disaster reduction, and sustainable development. We took approach-oriented research structure with six approaches: 1) the observation and estimation of precipitation; 2) process studies associated with land–atmosphere coupling; 3) scale interactions and predictabilities in subseasonal to interdecadal time scales; 4) high-resolution land surface hydrological modelling incorporating human impact and cryosphere; 5) field campaigns for coordinated observations and modelling initiatives; and 6) the detection and projection of climate change and downscaling. And the focus is naturally on the Asian monsoon system that governs hydroclimatological aspects of all Asian region.
The Asian monsoon is one of the most unique hydroclimatological systems in the world, associated with the formation of the Iranian-Tibetan plateaus due to a tectonic conflict between the Indian and Asian plates. The highest moist static energy airmass (HMSEA) accumulates over the Asian Continent, which extends over the southern edge of the Iranian-Tibetan plateaus and southern China. Its amount is significantly larger than that of other boreal summer monsoon regions and the austral summer monsoon regions (Figure). It generates strong convective activity over this region, heating the upper troposphere to push the subtropical westerly jet northward and to form a large anticyclonic circulation system, the Tibetan High. Corresponding to the jump in convective activity, the atmospheric general circulation undergoes a regime shift to establish interhemispheric wind systems including the Somali jet and the monsoon southwesterlies over the Indian and Pacific regions, the summer monsoon wind system. Glacier recharge in alpine areas is also an important condition for water resources. Active tectonic activities in this region and heavy rainfall due to the Asian monsoon convective clouds create mega-deltas like the Mekong, Brahmaputra, Ganges and Indus plains due to strong erosion and sedimentation, making the disaster in this area more devastating. Over these regions, supported by monsoonal periodic annual rainfall patterns, agricultural activities develop and now support the livelihoods of billions of people in Asia. The hydrological cycle determines the spatio-temporal distribution of available water resources.
Then, how and to what extent will the climate change affect the hydroclimatological system of the Asian monsoon? But climate model output still cannot even reproduce the observed distribution of Asian monsoon precipitation. AsiaPEX believes that the source of the uncertainty lies in our understanding of land-atmosphere coupling processes in Asia. How can we address hydroclimatological processes at the bottom of the atmosphere? Remote sensing and modelling research should be useful, but needs to be validated by real observations of water and energy exchanges in the lower troposphere. Therefore, we, AsiaPEX call for discussion and collaboration with the research activities that have several tens to hundreds kilometer scale process-oriened observational platforms to conduct a coordinated field campaign AMY-II within the 2020s integrated with remote sensing and modelling.
The Asian monsoon is one of the most unique hydroclimatological systems in the world, associated with the formation of the Iranian-Tibetan plateaus due to a tectonic conflict between the Indian and Asian plates. The highest moist static energy airmass (HMSEA) accumulates over the Asian Continent, which extends over the southern edge of the Iranian-Tibetan plateaus and southern China. Its amount is significantly larger than that of other boreal summer monsoon regions and the austral summer monsoon regions (Figure). It generates strong convective activity over this region, heating the upper troposphere to push the subtropical westerly jet northward and to form a large anticyclonic circulation system, the Tibetan High. Corresponding to the jump in convective activity, the atmospheric general circulation undergoes a regime shift to establish interhemispheric wind systems including the Somali jet and the monsoon southwesterlies over the Indian and Pacific regions, the summer monsoon wind system. Glacier recharge in alpine areas is also an important condition for water resources. Active tectonic activities in this region and heavy rainfall due to the Asian monsoon convective clouds create mega-deltas like the Mekong, Brahmaputra, Ganges and Indus plains due to strong erosion and sedimentation, making the disaster in this area more devastating. Over these regions, supported by monsoonal periodic annual rainfall patterns, agricultural activities develop and now support the livelihoods of billions of people in Asia. The hydrological cycle determines the spatio-temporal distribution of available water resources.
Then, how and to what extent will the climate change affect the hydroclimatological system of the Asian monsoon? But climate model output still cannot even reproduce the observed distribution of Asian monsoon precipitation. AsiaPEX believes that the source of the uncertainty lies in our understanding of land-atmosphere coupling processes in Asia. How can we address hydroclimatological processes at the bottom of the atmosphere? Remote sensing and modelling research should be useful, but needs to be validated by real observations of water and energy exchanges in the lower troposphere. Therefore, we, AsiaPEX call for discussion and collaboration with the research activities that have several tens to hundreds kilometer scale process-oriened observational platforms to conduct a coordinated field campaign AMY-II within the 2020s integrated with remote sensing and modelling.