A Unified Convection Scheme (UNICON). Part II: Simulation

被引:55
|
作者
Park, Sungsu [1 ]
机构
[1] Natl Ctr Atmospher Res, Climate & Global Dynam Div, Boulder, CO 80307 USA
基金
美国国家科学基金会;
关键词
COMMUNITY ATMOSPHERE MODEL; LARGE-EDDY SIMULATIONS; CUMULUS CONVECTION; RADIATION BUDGET; CLOUD; PRECIPITATION; PARAMETERIZATION; REANALYSIS; STRATOCUMULUS; CLIMATOLOGY;
D O I
10.1175/JAS-D-13-0234.1
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
A unified convection scheme (UNICON) is implemented into the Community Atmosphere Model, version 5 (CAM5), and tested in single-column and global simulations forced by observed sea surface temperature. Compared to CAMS, UNICON substantially improves the single-column simulations of stratocumulus-to-cumulus transition and shallow and deep convection cases. The global performance of UNICON is similar to CAMS with a relative spatiotemporal root-mean-square error (RMSE) of 0.777 (0.755 in CAMS) against the earlier version of the model (CCSM3.5). The notable improvements in the UNICON-simulated climatologies over CAMS are seasonal precipitation patterns (i.e., monsoon) over the western Pacific and South Asia, reduced biases of cloud radiative forcing in the tropical deep convection regions, aerosol optical depth in the tropical and subtropical regions, and cumulus fraction and in-cumulus condensate. One notable degradation is that UNICON simulates warmer near-surface air temperature over the United States during summer. In addition to the climatology, UNICON significantly improves the simulation of the diurnal cycle of precipitation and the Madden-Julian oscillation (MJO). The surface precipitation simulated by UNICON is a maximum in the late afternoon (early afternoon in CAMS) over the summer continents and in the early morning (predawn in CAMS) over the ocean with a fairly realistic amplitude of the diurnal cycle. Sensitivity simulations indicate that the key for successful MJO simulation in UNICON is a seamless parameterization of the updraft plume dilution rate as convection evolves from shallow to deep convection. The mesoscale perturbation of the vertical velocity and the thermodynamic scalars of convective updrafts is an additional requirement for simulating the observed diurnal cycle of precipitation.
引用
收藏
页码:3931 / 3973
页数:43
相关论文
共 50 条
  • [1] A Unified Convection Scheme (UNICON). Part I: Formulation
    Park, Sungsu
    [J]. JOURNAL OF THE ATMOSPHERIC SCIENCES, 2014, 71 (11) : 3902 - 3930
  • [2] A Stochastic Unified Convection Scheme (UNICON). Part I: Formulation and Single-Column Simulation for Shallow Convection
    Shin, Jihoon
    Park, Sungsu
    [J]. JOURNAL OF THE ATMOSPHERIC SCIENCES, 2020, 77 (02) : 583 - 610
  • [3] Parameterization of the Elevated Convection With a Unified Convection Scheme (UNICON) and Its Impacts on the Diurnal Cycle of Precipitation
    Park, Sungsu
    Song, Chanwoo
    Kim, Siyun
    Kim, Juwon
    [J]. JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS, 2024, 16 (03)
  • [4] Global Climate Simulated by the Seoul National University Atmosphere Model Version 0 with a Unified Convection Scheme (SAM0-UNICON)
    Park, Sungsu
    Shin, Jihoon
    Kim, Siyun
    Oh, Eunsil
    Kim, Yoonjae
    [J]. JOURNAL OF CLIMATE, 2019, 32 (10) : 2917 - 2949
  • [5] Global Simulation of the Madden-Julian Oscillation With Stochastic Unified Convection Scheme
    Shin, Jihoon
    Baik, Jong-Jin
    [J]. JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS, 2023, 15 (07)
  • [6] A Unified Representation of Deep Moist Convection in Numerical Modeling of the Atmosphere. Part II
    Wu, Chien-Ming
    Arakawa, Akio
    [J]. JOURNAL OF THE ATMOSPHERIC SCIENCES, 2014, 71 (06) : 2089 - 2103
  • [7] Study of distribution system unified conditioner (DS-UniCon)
    Wong, MC
    Han, YD
    Zhao, LB
    [J]. IPEMC 2000: THIRD INTERNATIONAL POWER ELECTRONICS AND MOTION CONTROL CONFERENCE, VOLS 1-3, PROCEEDINGS, 2000, : 1365 - 1370
  • [8] Unified Control (UniCon) Strategies for Grid-Connected Inverters
    Miranbeigi, Mohammadreza
    Kandula, Prasad
    Divan, Deepak
    [J]. 2021 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE), 2021, : 3000 - 3006
  • [9] Impact of Integrated Vertical Overlap of Cumulus and Stratus on the Global Precipitation and Radiation Processes in the Seoul National University Atmosphere Model Version 0 With a Unified Convection Scheme (SAM0-UNICON)
    Park, Sungsu
    Kim, Siyun
    Shin, Jihoon
    Oh, Eunsil
    [J]. JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS, 2019, 11 (02) : 468 - 484
  • [10] UniCon: Unified Context Network for Robust Active Speaker Detection
    Zhang, Yuanhang
    Liang, Susan
    Yang, Shuang
    Liu, Xiao
    Wu, Zhongqin
    Shan, Shiguang
    Chen, Xilin
    [J]. PROCEEDINGS OF THE 29TH ACM INTERNATIONAL CONFERENCE ON MULTIMEDIA, MM 2021, 2021, : 3964 - 3972