Moisture Balance for Bidecadal Variability of Wintertime Precipitation in the North Pacific Using NCEP/NCAR Reanalysis
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概要
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Moisture budgets are analyzed using National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data over the North Pacific for a Bi-Decadal Oscillation (BDO) in precipitation that was reported by Minobe and Nakanowatari (2002). BDO in wintertime precipitation is mostly associated with moisture flux convergence, with a minor contribution from evaporation. The moisture convergence is mainly due to anomalies of wind and moisture on time scales longer than a month, except at high-latitudes where transient eddy (time scales shorter than a month) contributions are greater. When the Aleutian low strengthens (weakens), the anomalous moisture flux convergence is due to a cyclonic (anti-cyclonic) wind circulation over 30°-60°N and anti-cyclonic (cyclonic) wind circulation over 0°-30°N. This pair of anomalous circulations is also observed on inter-annual time scales, but they appear independent of El Nino/Southern Oscillation (ENSO). The anomalous circulation over 0°-30°N is associated with sea-level pressure anomalies in the tropics (20°S-20°N) and this result is confirmed with the International Comprehensive Ocean-Atmosphere Data Set (ICOADS) and the NCEP real-time marine data. This low-latitude anomalous circulation plays a dominant role in precipitation variability in Hawaii on the bi-decadal and interannual time scales.
- 社団法人日本気象学会の論文
- 2005-08-25
著者
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Minobe Shoshiro
Division Of Earth And Planetary Sciences Graduate School Of Science Hokkaido University:(present Add
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Minobe Shoshiro
Division Of Earth And Planetary Sciences Graduate School Of Science Hokkaido University
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Nakanowatari Takuya
Division Of Earth And Planetary Sciences Graduate School Of Science Hokkaido University:(present Add
関連論文
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- Autumn Atmospheric Preconditioning for Interannual Variability of Wintertime Sea-Ice in the Okhotsk Sea
- Moisture Balance for Bidecadal Variability of Wintertime Precipitation in the North Pacific Using NCEP/NCAR Reanalysis