Role of the Midlatitude Air-Sea Interaction in Orographically Forced Climate
スポンサーリンク
概要
- 論文の詳細を見る
Possible feedbacks between the midlatitude atmosphere and ocean relevant to maintain the mean climatological state in January are examined by using a coupled model with intermediate complexity (ICM), which consists of a 2-layer atmospheric general circulation model (AGCM) and a 2.5-layer shallow water ocean model covering the Pacific Ocean. Two series of the numerical experiments including the seasonal cycle were conducted: the experiments using the coupled model (ICM run) and the experiments using the AGCM (AGCM run). In each series of the experiments, the global mountain height was systematically changed; a parameter α that is multiplied to the surface elevation was varied from 0 to 1.4 with the interval of 0.2. The ICM run with α = 1 is regarded as the control run. Comparison of the January climatology between the ICM and the AGCMshows that the upper-level wind and low-level baroclinicity over the western Pacific Ocean increase linearly with α in both models while the sensitivity to change in α is higher in the ICM. This appears to be explained by the following positive feedback; in the coupling system, orographically forced stationary waves at larger α spin up ocean gyres, transporting the warm water near the western boundary that results in an enhancement of local evaporation and precipitation. The latent heat release works to intensify the stationary waves which are responsible to maintain the low-level baroclinicity. The low-level wind, SST and the storm track activity do not change linearly with increasing α. In particular, the storm track strengthens with mountain uplift until a = 0.6 while weakening afterwards. This weakened storm track decelerates the low-level wind downstream, which reduces the wind-driven circulation and the increase in SST around the gyre boundary at the heigher mountain.
- 社団法人日本気象学会の論文
- 2008-04-25
著者
-
KIMOTO MASAHIDE
Center for Climate System Research, The University of Tokyo
-
Kimoto Masahide
Center For Climate System Research The University Of Tokyo
-
Watanabe Masahiro
Faculty of Science and Engineering, Meijo Unviersity
-
KOSEKI Shunya
Graduate School of Environmental Science, Hokkaiod University
-
Koseki Shunya
Graduate School Of Environmental Science Hokkaiod University
-
Watanabe Masahiro
Faculty Of Environmental Earth Science Hokkaiod University:center For Climate System Research The University Of Tokyo
関連論文
- Reevaluation of Historical Ocean Heat Content Variations with Time-Varying XBT and MBT Depth Bias Corrections
- Interannual-Interdecadal Variation in Large-Scale Atmospheric Circulation and Extremely Wet and Dry Summers in China/Japan during 1951-2000 Part II : Dominant Timescales
- Interannual-Interdecadal Variation in Large-Scale Atmospheric Circulation and Extremely Wet and Dry Summers in China/Japan during 1951-2000 Part I : Spatial Patterns
- Analysis on the Dynamics of a Wave-like Teleconnection Pattern along the Summertime Asian Jet Based on a Reanalysis Dataset and Climate Model Simulations(Evaluations of CMIP3 Model Performance for Various Atmospheric and Oceanic Phenomena
- 気候監視のための海洋デ-タ同化システム
- Microwave Dielectric Properties of Sm_2Ba(Cu_Zn_x)O_5(x = 0 to 1) Solid Solutions
- Microwave Dielectric Properties of Y_2Ba(Cu_Zn_x)O_5 Solid Solutions
- Diurnal March of Rainfall Simulated in a T106 AGCM and Dependence on Cumulus Schemes(The International Workshop on High-Resolution and Cloud Modeling, 2006)
- Relationship between Springtime Surface Temperature and Early Summer Blocking Activity over Siberia
- Simulation of the 1998 East Asian Summer Monsoon by the CCSR/NIES AGCM
- Steric Sea Level Changes Estimated from Historical Ocean Subsurface Temperature and Salinity Analyses
- The Growth and Triggering Mechanisms of the PNA : A MJO-PNA Coherence
- Role of the Midlatitude Air-Sea Interaction in Orographically Forced Climate
- Investigations of Polarization-Induced Hole Accumulations and Vertical Hole Conductions in GaN/AlGaN Heterostructures
- Investigations of Polarization-Induced Hole Accumulations and Vertical Hole Conductions in GaN/AlGaN Heterostructures (Special Issue : Recent Advances in Nitride Semiconductors)