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Geochemical, stable isotopic, palynological characterization of surface dry soils and atmospheric particles over Jodhpur city (Thar Desert, Rajasthan) during peak summer of 2013
Ist Teil von
MĀPAN : journal of Metrology Society of India, 2020-03, Vol.35 (1), p.53-67
Ort / Verlag
New Delhi: Springer India
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Atmospheric dust originating from the Thar Desert (India) acts as the local source of mineral dust in South Asia, spreading over an area of 0.32 × 10
6
km
2
. Regional studies conducted during peak boreal summer are required to characterize this mineral dust that blows in form of episodic dust storms towards Indo-Gangetic Plains (IGP), using a multi-tracer approach. To achieve this goal, atmospheric PM
10
particles were collected along with surface dry soils between 3 and 11 June, 2013, from in and around the Jodhpur city (26.2389°N, 73.0243°E) to glean elemental composition, stable isotopic and palynological (pollen types) database. Typical crustal elemental ratios, e.g. Si/Al, Ca/Al, Fe/Al, K/Al, Mg/Al, Ti/Al, varied in narrow ranges 8.1 ± 1.21, 1.02 ± 1.53, 0.50 ± 0.14, 0.34 ± 0.06, 0.19 ± 0.06 and 0.06 ± 0.02, respectively. Average Sr/Al, Rb/Al and Zr/Al ratios were found to be 39.70 ± 12.24, 18.00 ± 2.0 and 70.83 ± 13.11 (μg gm
−1
/wt%), respectively. Average δ
13
C, δ
15
N, δ
34
S values of surface soils were − 10.5‰ ± 4.0, 11.4‰ ± 1.6 and 3.6‰ ± 2.1, while δ
13
C and δ
15
N of atmospheric PM
10
particles varied in ranges − 25.6‰ ± 0.67 and 9.9‰ ± 1.7, respectively. Observed palynoassemblage indicated the open nature of vegetation that usually grows under warm-humid conditions with traces of few allergens and pathogens. Generated chemical-isotopic-pollen database could be utilized for deciphering origin of dust storms in IGP. Detailed multi-proxy characterization of mineral dust from the Thar Desert can further help to determine its role in influencing air quality and human health.