Geoscience Reference
In-Depth Information
arrives, there appears a cold source in the west and a weak heat source
in the east of the QTP. As November (figure omitted) sets in, the QTP is
under the control of cold sources distributed in a similar pattern to that
in January. In December, the cold source is the strongest, centered at the
southeast QTP, with its values lower than
−
150 W/m
2
.
horizontal distribution shows that from April to
August, the heat source is stronger in the west than in the east, with the
contour located more northward in the west than in the east. In Spring,
the western heat source intensifies rapidly and not until May-June does the
eastern one do so. The center of 200 W/m
2
appears in May in the west, but
in June in the east. Starting from July, the heat sources begin weakening
southward, with the western one abating quickly. The heat source changes
into a cold one in the west (east) in October (November).
To sum up,
Q
1
4. The
Space/Time Variations
Q
1
Only the 1979-2001 data were used for EOF study. The
was separated
into four seasons, and the mode of greater variance contribution (EOF1)
was taken out for discussion, as shown in Fig. 5.
In Spring, the
Q
1
spatial pattern of EOF1 displays anti-phase change
in the central-Northeast and Southeast QTP, the variability center value
in the central source being twice as high as in the Southeast counterpart.
From the time series, we see that a positive (negative) amplitude occurs in
Q
1
Fig. 5. EOF analysis of the QTP
Q
1
, giving the EOF1 Spring space pattern in (a),
the timeseries in (b), the Summer pattern in (c), and the timeseries in (d).
