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page 106 of 142 RIVM report 773301 001 / NRP report 410200 051 $JULFXOWXUH&+ IURPULFHFXOWLYDWLRQ Methane emissions from rice cultivation are known to be highly seasonal. From the many publications on this subject we present a few graphs in which the seasonality is presented and compared from a number of model studies. In Figure A.2.9 the seasonality in emissions from three world regions is presented as modelled by Cao HWDO (1996). Apparently, the seasonality is the strongest in the northern regions. In the north 75% of annual CH 4 from rice paddies is emitted between June and October, whereas in the south 90% was emitted between November and March; in the near-equator region emission show much less seasonality (Cao HWDO., 1996). In Figure A2.10 the results of Cao are compared with results presented by Asselmann and Crutzen. Both seasonal variation patterns look rather similar. Finally, in Figure A.2.11 the seasonal variation of CH 4 emissions from rice paddies in China is presented for different latitudes. )LJ$6HDVRQDOYDULDWLRQLQPHWKDQHHPLVVLRQVIURPULFHSDGGLHVLQQRUWKHUQQHDUHTXDWRULDODQGVRXWKHUQ UHJLRQVDLQWKHUDWHNJP GD\ELQPRQWKO\WRWDOPHWKDQHHPLVVLRQVIURPULFHSDGGLHV6RXUFH&DRHWDO )LJ$&RPSDULVRQRIVHDVRQDOYDULDWLRQRIPHWKDQHHPLVVLRQVIURPULFHSDGGLHVLQ&DRHWDODQG $VVHOPDQQDQG&UXW]HQ
RIVM report 773301 001 / NRP report 410200 051 page 107 of 142 )LJ $ 6HDVRQDO YDULDWLRQ RI PHWKDQH HPLVVLRQV IURP ULFH SDGGLHV LQ &KLQD DQG WKHLU GHSHQGHQFH RQ WKH ODWLWXGH %LRPDVVEXUQLQJ Biomass burning (deforestation, savannah burning, field burning of agricultural wastes) is limited to the dry season, therefore showing very clear seasonal patterns (Fig. A.2.12). However, it is very difficult to get accurate seasonal profiles, since this seasonal pattern may differ substantially between years (Fig. A.2.13) and regions (Fig. A.2.14). )LJ$6HDVRQDOLW\RIJOREDOELRPDVVEXUQLQJ6RXUFH+DRDQG/LX
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