By Erik A. Rasmussen, John Turner
Offering a entire evaluate of our knowing of the small, excessive range climate platforms often called polar lows, Erik Rasmussen and John Turner describe the climatological distribution of those depressions. They conceal observational investigations into their constitution, the operational forecasting of polar lows and the theoretical learn into why they boost. additionally they speak about the experiments that display that a few polar lows will be anticipated. This ebook is of price to researchers climate forecasters concerned about polar areas.
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Extra info for Polar Lows: Mesoscale Weather Systems in the Polar Regions
Uk/journals)). to reduced vertical stability caused by the very low upper-level temperatures near the centre. These cold low-type polar lows, which are quite common, will generally be of the spiraliform type and were included in the 1989 classiﬁcation of Businger and Reed as the ‘cold-low type’. 15. 15b–d. 4). 16. This pronounced spiral was associated with a well-developed surface low, formed as an upper-level, cold low on a southerly track east of Greenland passed over the sea around Iceland. 15.
Deeply convective spiraliform systems comprise less than 25% of all spiraliform systems occurring over latitudes poleward of about 50◦ S, and only 10% of all mesoscale cyclones observed (Carleton, 1995, [his] table 5). Turner et al. (1993a) ascribe this difference in convective development within Antarctic mesoscale cyclones to the stronger static stability over the ice sheet or ice-free but cold open water that occurs in summer. When spiraliform mesoscale cyclones are observed on satellite imagery for the southern oceans they are more likely (about 57%) to comprise stratocumulus clouds at low altitudes (Carleton, 1995).
11a (cf. 9). The southern spiral, which was also associated with a cold core low, was composed of more loosely organized spiral segments of convective clouds. ). 11b). For a correct interpretation of the mechanisms behind the formation of the two systems and their similarities/differences, it should be noted that the southerly 500 hPa trough had formed through a superposition of a vortex and a basic westerly ﬂow. 11c) as a well-developed low. 6 Cloud signatures between the upper and lower levels (see the omega equation, Eqn.