Mohammad Rubaiat Islam
@precip.info
Precipitation Research Group
Scopus Publications
Scopus Publications
Travis A. O’Brien, Burlen Loring, Amanda Sabatini Dufek, Mohammad Rubaiat Islam, Diya Kamnani, Kwesi Twentwewa Quagraine, and Cody Kirkpatrick
American Geophysical Union (AGU)
AbstractAtmospheric rivers (ARs) significantly impact the hydrological cycle and associated extremes in western continental regions. Recent studies suggest ARs also influence water resources and extremes in continental interiors. AR detection tools indicate that AR conditions are relatively frequent in areas east of the Rocky Mountains. The origin of these ARs, whether from synoptic‐scale waves or mesoscale processes, is unclear. This study uses meteorological composite maps and transects of AR conditions during the four seasons. The analysis reveals that ARs east of the Rockies are associated with long‐wave, baroclinic Rossby waves. This result demonstrates that eastern North American ARs are dynamically similar to their western coastal counterparts, though mechanisms for vertical moisture flux differ between the two. These findings provide a foundation for understanding future climate change and ARs in this region and offer new methods for evaluating climate model simulations.
Mohammad Rubaiat Islam, Jing Gao, Nasir Ahmed, Mohammad Masud Karim, Abdul Quaiyum Bhuiyan, Ariful Ahsan, and Shamsuddin Ahmed
Elsevier BV
Abstract Indian summer monsoon (ISM) driven moisture from the Indian Ocean is important for moisture transport to the Asian Water Towers and causing floods and droughts in Bangladesh. Stable isotopic compositions of precipitation (δ18O and δD) are crucial tracers of ISM moisture transport processes. Here we presented spatiotemporal variations of stable isotopes in precipitation at three stations over Bangladesh in 2017–2018 to evaluate the influence of ISM on intra-seasonal variations of stable isotopes in precipitation in the south of Himalaya, combined with local meteorological data, ERA5 reanalysis and HYSPLIT model. We found that precipitation δ18O displayed the highest values in May following gradual decrease till the lowest in October. The spatial decrease of δ18O and δD from southwest to northeast appeared in pre-monsoon and monsoon seasons together with increasing of d-excess eastwards. The weak temperature effect and amount effect were detected at Satkhira only at the daily scale in specific seasons, and the significantly negative correlations between relative humidity and δ18O were almost detected at three stations in both monsoon and non-monsoon seasons. We suggested that convections over Bay of Bengal (BOB) and tropical Indian Ocean and variable contributions of moisture sources are important factors controlling distinct variations of precipitation δ18O from west to east Bangladesh. Our results provided a better understanding of the ISM influence on precipitation stable isotopes and variations of the ISM moisture sources, which is crucial to address hydroclimatic interpretations relevant with ISM.