An increase of ammonia emissions from terrestrial ecosystems on the Tibetan Plateau since 1980 deduced from ice core record

Zou, Xiang; Hou, Shugui; Zhang, Wangbin; Liu, Ke; Yu, Jie; Pang, Hongxi; Liu, Yaping

doi:10.1016/j.envpol.2020.114314

Cited by 10 publications

(12 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increase rates between these two periods were all about 1.5 times in these two sites. This increased trend was also observed for other ice cores inland of the TP, i.e., Tanggula ice core (Zheng et al, 2010), Qiangtang ice core (Wang et al, 2019), and Zangser Kangri ice core (Zou et al, 2020), but with a relatively weakly increased amplitude. All these increased trends could be attributed to the contribution of ammonium as illustrated from the dominant molar ratios of ammonium versus the total nitrogen (Figure 5) (Zou et al, 2020).…”

Section: Historical Records Of Nitrogen Deposition In Western Chinasupporting

confidence: 67%

Concentrations, Compositions, and Deposition Rates of Dissolved Nitrogen in Western China: Insights From Snow Records

Liu

et al. 2022

Front. Environ. Sci.

View full text Add to dashboard Cite

Atmospheric nitrogen deposition is an important contributor to global and regional nitrogen cycles, and atmospheric nitrogen could be a critical limit nutrient for remote areas. In this study, nitrogen species compositions, deposition fluxes, and historical records in the mountains of Western China, including the Tibetan Plateau, were determined from snowpit and ice core samples collected from mountain glaciers. The mean concentration of total dissolved nitrogen (TDN) in the snowpit samples was 12.6 μmol L−1 (8.0–17.8 μmol L−1) and comprised 59% ammonium nitrogen, 35% nitrate nitrogen, and ∼6% dissolved organic nitrogen. The deposition of nitrogen species, except organic nitrogen (likely due to its low concentrations and/or different origination), varied seasonally in a similar way based on the records of the snowpit profile. Based on monthly surface sample collection in one of the glaciers, the mass concentration and composition of nitrogen species varied monthly, mainly because of melting processes. During melting, the inorganic nitrogen content could be lost significantly, whereas the dissolved organic nitrogen concentration could be enriched because of microbial activity. For the historical records, the nitrogen deposition in mountain areas of Western China after 1960s was increased by about one time of that during 1900–1950 and was dominated by ammonium-N. From the snowpit data, we estimated the total dissolved nitrogen deposition flux at 0.56–1.3 (mean 0.88) kg ha−1 a−1 in the mountain area of Western China. These results could improve our understanding of nitrogen deposition and cycle in the mountain areas of Western China.

show abstract

Section: Historical Records Of Nitrogen Deposition In Western Chinasupporting

confidence: 67%

Concentrations, Compositions, and Deposition Rates of Dissolved Nitrogen in Western China: Insights From Snow Records

Liu

et al. 2022

Front. Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…LHG Ca 2+ concentrations associated with wind speed and precipitation decreased, while calculated by the average of these four 𝐴𝐴 NH + 4 z-scores. Previous studies have indicated that these 𝐴𝐴 NH + 4 records reconstructed from the central TP exhibit an increasing trend in the last decades of the last century (Tenzin, 2016;Zheng et al, 2010;Zou et al, 2020), although these four records developed from the central TP do not show obvious similarities to each other for the period 1950-2004 in Figure 5 Taken together, an increase in ammonium concentration widely exists in ice cores from different regions of the TP during the last few decades of the 20th century. Enhanced anthropogenic emissions, regional lake expansion in central Asia, and biogenic emissions likely contribute to the enhancement of 𝐴𝐴 NH + 4 of glaciers on the TP (L. G. Thompson et al, 2018;Zheng et al, 2010;Zou et al, 2020).…”

Section: Comparison Of Qt To Other Ice Core Ammonium Recordsmentioning

confidence: 99%

“…Previous studies have indicated that these 𝐴𝐴 NH + 4 records reconstructed from the central TP exhibit an increasing trend in the last decades of the last century (Tenzin, 2016;Zheng et al, 2010;Zou et al, 2020), although these four records developed from the central TP do not show obvious similarities to each other for the period 1950-2004 in Figure 5 Taken together, an increase in ammonium concentration widely exists in ice cores from different regions of the TP during the last few decades of the 20th century. Enhanced anthropogenic emissions, regional lake expansion in central Asia, and biogenic emissions likely contribute to the enhancement of 𝐴𝐴 NH + 4 of glaciers on the TP (L. G. Thompson et al, 2018;Zheng et al, 2010;Zou et al, 2020). The increase in QT 𝐴𝐴 NH + 4 and 𝐴𝐴 NO − 3 concentrations and stronger correlations between them after 1955 (Table S1 in Supporting Information S1) probably suggests that enhanced agricultural emissions such as the application of nitrogen fertilizer and biomass burning could contribute to high 𝐴𝐴 NH + 4 concentrations in the QT ice core since the 1950s.…”

Section: Comparison Of Qt To Other Ice Core Ammonium Recordsmentioning

confidence: 99%

“…These studies have suggested that the increase in 𝐴𝐴 NH + 4 concentrations after the 1940s is attributed to the enhancement of NH 3 emissions from anthropogenic sources in southern Asia and/or central Asia. Moreover, other studies in ice cores from the inner TP have revealed that the dramatic temperature increase since 1950 may have enhanced biological activity and subsequently increased ammonia emissions from the regional terrestrial ecosystems (Zheng et al, 2010;Zou et al, 2020). Zou et al (2020) also proposed that NH 3 emissions from agricultural activities in the northwestern Indian Peninsula likely contribute to the ammonium deposition in the Zangser Kangri (ZSK) ice core via the Indian summer monsoon.…”

mentioning

confidence: 99%

“…Moreover, other studies in ice cores from the inner TP have revealed that the dramatic temperature increase since 1950 may have enhanced biological activity and subsequently increased ammonia emissions from the regional terrestrial ecosystems (Zheng et al, 2010;Zou et al, 2020). Zou et al (2020) also proposed that NH 3 emissions from agricultural activities in the northwestern Indian Peninsula likely contribute to the ammonium deposition in the Zangser Kangri (ZSK) ice core via the Indian summer monsoon. These records indicate that heterogeneous distribution patterns of the ammonium deposition are associated with differences in the sources, local climate factors, and atmospheric circulations over the TP.…”

mentioning

confidence: 99%

See 2 more Smart Citations

A Century Ammonium Record Retrieved From the Central Tibetan Plateau

et al. 2023

View full text Add to dashboard Cite

The limited observations pose challenges to understanding long‐term variations of atmospheric ammonium (NH4+ ${\text{NH}}_{4}^{+}$) deposition. Glaciers on the margins of the Tibetan Plateau (TP) adjacent to heavily populated regions can capture and preserve unique records of natural and anthropogenic ammonium aerosol. However, relatively little has been known about spatiotemporal variations and anthropogenic influences on ammonium deposition on the central TP. Here, we present a high‐resolution ammonium record spanning the period 1900–2011, reconstructed from the Qiangtang (QT) ice core on the central TP. Empirical orthogonal function and interspecies correlation analysis reveal that NH4+ ${\text{NH}}_{4}^{+}$ has a source and/or transport route that differs from the dust species, especially after the 1950s. The QT ammonium record is also likely influenced by temperature‐dependent biogenic emissions from northwestern South Asia. Comparison with other ice core records shows that intensified anthropogenic emissions have caused a widespread increase in ammonium records in the inner TP after the 1950s. Furthermore, the significant positive relationship with the December–April Arctic Oscillation (AO) suggests that enhanced westerlies during the positive AO phase transport NH4+ ${\text{NH}}_{4}^{+}$ aerosol more efficiently to the QT. As a result, the decrease in ammonium concentrations after 1990, when anthropogenic emissions were still increasing, could be attributed to the weakening of westerlies associated with the transitioning of the AO phase from positive to negative. Our results may enhance the understanding of the influence of the westerlies on the transport of atmospheric pollutants to the central TP.

show abstract

A high-resolution refractory black carbon (rBC) record since 1932 deduced from the Chongce ice core, Tibetan plateau

Liu

Wang²,

Hou³

et al. 2023

Atmospheric Environment

View full text Add to dashboard Cite

An increase of ammonia emissions from terrestrial ecosystems on the Tibetan Plateau since 1980 deduced from ice core record

Cited by 10 publications

References 40 publications

Concentrations, Compositions, and Deposition Rates of Dissolved Nitrogen in Western China: Insights From Snow Records

Concentrations, Compositions, and Deposition Rates of Dissolved Nitrogen in Western China: Insights From Snow Records

A Century Ammonium Record Retrieved From the Central Tibetan Plateau

A high-resolution refractory black carbon (rBC) record since 1932 deduced from the Chongce ice core, Tibetan plateau

Contact Info

Product

Resources

About