Impact of the subgrid representation of parameterized convection on simulated climatology
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields



Publication Date Range:


Document Data


Document Type:






Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page


Impact of the subgrid representation of parameterized convection on simulated climatology

Filetype[PDF-2.82 MB]


  • Personal Author:
  • Description:
    The sensitivity of general circulation models (GCMs) to the subgrid representation of parameterized convection is investigated. Various experiments testing the sensitivity of the simulated climatology to parameter in convective downdrafts were conducted within the framework of a perpetual January run. The mass flux of the parameterized downdraft is varied in magnitude up to the maximum value allowed within the current parameterization framework over the ocean, while over land it is bounded to a specific value. This concept is based on the fact that soil temperature and moisture over land are highly correlated to the amount of parameterized convective precipitation, whereas over the ocean the corresponding subsurface properties in the model are prescribed by the sea surface temperature. The impact of enhanced evaporation of precipitation over the oceans was also discussed. The sensitivity experiment was extended to an ensemble simulation framework for two different summers and winters, in terms of SST over the tropical oceans. The modified scheme with an maximum downdraft over the ocean clearly shows improvements compared to that from the convection scheme with a suppressed downdraft. The modified scheme suppresses the erroneously excessive rainfall north of the equator and increases rainfall over the Southern Hemispheric oceans, which generally agrees better with the observed January precipitation climatology. The improvement is also significant in the low-level wind distribution, particularly easterlies over the equatorial Pacific between 130-160 W, which are too weak in the operational version of the scheme. Enhanced evaporation shows comparable impact to modified downdrafts in that both effects play a role in stabilizing the atmosphere. Ensemble simulations with it, for January of 1997 and 1998, reveal consistent improvement in precipitation anomalies as achieved in the perpetual run. The improvement of simulated precipitation anomalies for July of 1996 and 1997 is also significant in response to SST anomalies over the tropical oceans.
  • Content Notes:
    Song-You Hong.

    "January 2000."

    System requirements: Adobe Acrobat Reader.

    Includes bibliographical references (pages 13-15).

  • Document Type:
  • Place as Subject:
  • Rights Information:
    Public Domain
  • Compliance:
  • Main Document Checksum:
  • File Type:

Supporting Files

  • No Additional Files

More +

You May Also Like

Checkout today's featured content at

Version 3.26