Quantifying recycled moisture fraction in precipitation of an arid region using deuterium excess

Figures & data

Fig. 1.  Geographical distribution of sampling sites and Urumqi station, derived from database of the International Atomic Energy Agency–World Meteorological Organization (IAEA–WMO) Global Network of Isotopes in Precipitation (GNIP). The inset is schematic representation of the moisture-controlling weather patterns and rainfall regime in the study area (after Araguás-Araguás et al., 1998).

Table 1. Summary of samples for isotopes in precipitation

	Location
Station	Latitude	Longitude	Altitude, m.a.s.l	Mean annual temp., °C	Annual precipitation, mm	Sampling	Sampling period	Data source
Gaoshan	43°06′	86°50′				3545	−2.6	390	Event-based	April, 2003–March, 2004	This study
Houxia	43°17′	87°11′	2100	1.1	424	Event-based	May, 2003–April, 2004	This study
Urumqi	43°47′	87°37′	918	7.7	306	Monthly	1968–2003	GNIP

Fig. 2.  Sub-cloud evaporation: change of the d-excess with increasing evaporated fraction estimated at Gaoshan, Houxia and Urumqi stations. The numbers near the triangle symbol represent the month (4 – April, 5 – May, etc.).

Table 2. Change of d-excess with increasing evaporated fraction

Station	K (‰/%)
Gaoshan	−1.1
Houxia	−1.1
Urumqi	−1.2
Alps mountains	−1.1

Table 3. Results of monthly recycling fraction at Gaoshan, Houxia and Urumqi stations

	Recycling fraction (%)
Station	1	2	3	4	5	6	7	8	9	10	11	12
Gaoshan	0	0	0	0	0	1.0	0	0	*	0	0	0
Houxia	0	0	0	0	1.2	1.8	0.9	0	0	0	0	0
Urumqi	0	7.0	1.7	7.4	5.7	6.8	11.0	12.0	12.4	15.0	4.3	3.5

*No data of humidity in September, 2003, at Gaoshan station.

Fig. 3.  Recycling fraction in precipitation and precipitation amount at Urumqi station. The blue column is precipitation amount and the red column represents the recycling amount during each month. The curve is the recycling fraction during each month and the red line is a weighted average recycling fraction with the value of 8%.

Araguás-Araguás L, Froehlich K, Rozanski K. Stable isotope composition of precipitation over southeast Asia. J. Geophys. Res. 1998; 103(D22): 28721–28728, 742. 10.3402/tellusb.v65i0.19251.

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