During
autumn 2006, mean surface air temperatures were above normal in most of China with
anomalies above 1℃ except they were near normal in northern Northeast China,
eastern Tibet and western Southwest China. 2~3℃ positive anomalies were
observed in most of Northwest China, central and western Inner Mongolia, parts
of North China, and Shangdong.
For
the season, precipitation totals were 30-50% less than average in eastern Inner
Mongolia, parts of Northeast China, southern Guangxi, Hainan, western Tibet and
most of Xinjiang, with no precipitation in parts of southern Xinjiang.
Meanwhile, rainfall totals were more than 30-50% in western and southeastern
Xinjiang, western and eastern Qinghai, southeastern Tibet, western and central
Inner Mongolia, southern Jiangxi.
During
autumn 2006, mean surface air temperatures were 1℃
above normal in most of China,
central Asia, most Europe, the far east in Russia, Alaska and most of Australia,
with 3℃ above normal in northwestern China, most of
Germany and the far east in Russia. Meanwhile, temperatures were near or below
normal in the other regions, and they were 1℃
below normal in most of Siberia and USA.
For
the autumn, rainfall totals were more than 30-50% above average in parts of
China, southern India, most of central and western Asia, parts of central Siberia,
the far east in Russia, northern and western Europe, eastern and northwestern
USA, western Alaska, southern West Africa, western Australia, Paraguay, western
and coast of eastern Brazil, with 100% above average in locals. Meanwhile, precipitation
totals were 30-50% less than average in most of northern and western China,
Mongolia, northern India, southeastern Europe, western and parts of central USA,
eastern Alaska, northern West
Africa, most of Australia and Venezuela, with no precipitation in locals.
Northern
Hemisphere: During autumn 2006, the mean 500hPa geopotential height field exhibited
mainly a 4-wave pattern at the mid-high latitudes. Positive anomalies above 4
dam covered most of Europe, the region from northern North America to
northwestern North Pacific, with maximum above 8 dam over northwestern North
Pacific. Meanwhile, negative departures below -4 dam controlled northeastern
North Atlantic.
For the season, the area and intensity of Northwest Pacific subtropical high
were above normal.
Southern
Hemisphere: For the month, zonal circulation prevailed over mid-high latitudes in
the mean 500hPa geopotential height field. In the 500hPa height
anomaly field, negative height
anomalies below -4 dam covered
the southern South Pacific Ocean. Heights were near or above normal in
the rest regions. Positive height anomalies above 4 dam were observed over
southeastern South Pacific, southern Australia, oceans south to Australia and
region over 60ºE～90ºE，20ºS～40ºS.