Evolution of the Water Vapor Plume over Eastern Europe during Summer 2010 Atmospheric Blocking

Table 3

Water vapor anomalies in the surface layer (0 km) and at the altitudes 3 km and 8 km (ppm) as well as the anomalies of tropopause height (𝐻 trop (km)) and temperature (𝑇 trop (°C)) before (P1), during (P2), and after (P3) blocking events of the summer 2010 and their differences obtained using upper air data (Table 1). The percentage differences in relation to the local yearly mean values are shown in parentheses. Last column represent a probability (𝑃 value) that the medians of three groups of the anomalies are from the same population, calculated using the Kruskal-Wallis test.

Altitude (km)	P1: 7–21 June	P2: 22 June–16 August	P3: 17–31 August	P1−P2		P3−P2		𝑃 value
8	−103	122	−193	225	(101)	−315	(−142)	8⋅10^−9
3	−1045	840	−1540	1885	(65)	−2380	(−82)	5⋅10^−9
0	−2092	1839	−3268	3931	(59)	−5107	(−76)	7⋅10^−11
𝐻 trop	−0.8	0.4	−0.9	1.2	(12)	−1.3	(13)	4⋅10^−11
𝑇 trop	2.4	−0.6	1.8	−3	(−5)	2.4	(4)	3⋅10^−6