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Ǯ����ή�����̵�����Ǯ�ӳ��̿岹���Ф����������ľ��Ǯ�ե�å��� �δ�Ϳ-(���� ��ʿ) ȯɽ�׻� :

����ή������(Ǯ�ӷ�����)���㲹�Τ���ˡ�Ǯ�ӷ����̤��̲ᤷ��
���ط��˻��������ο������ŷ뤵������̤Ȥ������ط��˴����⤿�餹��
����Ρ����ط��ο�����̤򥳥�ȥ����뤹��������ġ�
Ǯ�ӷ����̵�������ư�ᥫ�˥�������򤹤�ΤϽ��פȤʤ롣
Ǯ�ӷ����̵����ϵ�����ư����ۤ��Ƥ��ꡢ���μ��פ���ư�ᥫ�˥���Ȥ��ơ�
���ط��������٤����Ť���ץ�ͥ��꡼�Ȥθ���(Holton et al.,1995�ʤ�)�ȡ�
Ǯ�ӤǷ������оΤ���ή�ˤ���嵯���줿�Ȥθ���
(Kerr-Munslow and Norton, 2006; Norton, 2006)���󤲤��롣

�ܸ���Ǥ��絤��۴ĥ�ǥ�(CCSR/NIES AGCM)����Ѥ���
Ǯ�ӳ��̿岹(SST)ʬ�ۤ���ή�����̤���Ǯ�ӷ����̵�����Ϳ����ƶ���Ĵ�٤���
�Ԥä����ͼ¸��ϥ�ǥ�ǻ��Ѥ��뵤����SST���Ф�Ǯ��(15S-15N)�ˤ����ơ�
SST�η��������(����ʿ�Ѥ���Τ���)������/���ꤵ�������ͼ¸�(S'runs)�ȡ�
SST����ͤ˾徺/�㲼���������ͼ¸�(S runs)�Ǥ��롣

���ͼ¸��η�̡�Ǯ��SST�η�������ͤ�����/���ꤵ����ȡ�
Ǯ�ӷ����̵������㲼/�徺���뤳�Ȥ����餫�ˤʤꡢ
�����Ѳ����Ф�Matsuno-Gill�ѥ�����(Matsuno, 1966; Gill, 1980)���������
������α��ˤ���ľǮ͢���αƶ�����ۤ��뤳�Ȥ������줿��
����Ͻ����󾧤�����褿Ǯ�ӷ����̵�������ư�ᥫ�˥���Ȥϰۤʤ뿷�������̤Ǥ��롣
�ޤ����Ƥμ¸��ǡ�Ǯ��50hPa�ն�ˤ����ơ�
��ľή�ˤ����Ǯ�����Ѳ����б������������Ѳ�������줿��
������Ǯ��SST�η�������ͤϥ���ˡ��˥�������ư(ENSO)�ȴط����������ᡢ
���¤�ENSO���٥�Ȥ�����ʻ���(1996ǯ-1999ǯ)�δ�¬SST���Ѥ������ͼ¸��ȡ�
��¬(ERA40)����Ӥ����ꡢξ�Ԥ���������Ҥο��ͼ¸��η�̤�ٻ������̤�����줿��


Abstract:
The tropical tropopause (TT) temperature is controlled both by the
midlatitude stratospheric pump and equatorial waves caused by tropical
convection. To understand how the TT temperature is influenced by
tropical convection, variations of TT temperature associated with
changes in the tropical sea surface temperature (SST) distribution are
examined with an atmospheric general circulation model (CCSR/NIES AGCM).
In one type of experiment, the zonal asymmetry of tropical SST is
changed (S' runs). In the other type of experiment, tropical SSTs are
changed uniformly (S runs).
For all experiments, adiabatic cooling or heating induced by changes in
the Brewer-Dobson circulation is dominant in the tropical lower
stratosphere (50 hPa), which is consistent with control by the
stratospheric pump. However, at the TT level (90 hPa), adiabatic effects
are not a primary factor. In S' runs, the enhancement (weakening) of the
tropical SSTs' zonal asymmetry causes cooling (warming) of zonal-mean TT
temperature via a vertical eddy heat flux associated with a Gill-type
equatorial wave pattern. These results show that the vertical eddy heat
flux is important for causing variations of zonal-mean TT temperature,
especially interannual variations associated with ENSO.

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