ORCID Profile
0000-0002-3089-0820
Current Organisation
Institute of Tibetan Plateau Research Chinese Academy of Sciences
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Publisher: AIP Publishing
Date: 05-2023
DOI: 10.1063/5.0135125
Abstract: In this paper, we present the design and performance of the upgraded University of Florida torsion pendulum facility for testing inertial sensor technology related to space-based gravitational wave observatories and geodesy missions. In particular, much work has been conducted on inertial sensor technology related to the Laser Interferometer Space Antenna (LISA) space gravitational wave observatory mission. A significant upgrade to the facility was the incorporation of a newly designed and fabricated LISA-like gravitational reference sensor (GRS) based on the LISA Pathfinder GRS. Its LISA-like geometry has allowed us to make noise measurements that are more representative of those in LISA and has allowed for the characterization of the mechanisms of noise induced on a LISA GRS and their underlying physics. Noise performance results and experiments exploring the effect of temperature gradients across the sensor will also be discussed. The LISA-like sensor also includes unique UV light injection geometries for UV LED based charge management. Pulsed and DC charge management experiments have been conducted using the University of Florida charge management group’s technology readiness level 4 charge management device. These experiments have allowed for the testing of charge management system hardware and techniques as well as characterizations of the dynamics of GRS test mass charging. The work presented here demonstrates the upgraded torsion pendulum’s ability to act as an effective testbed for GRS technology.
Publisher: American Geophysical Union (AGU)
Date: 26-04-2021
DOI: 10.1029/2021GL092708
Abstract: The contrasting responses of ice core δ 18 O records (δ 18 O ice ) from the northern and southern Tibetan Plateau (TP) to the El Niño Southern Oscillation (ENSO) complicate δ 18 O ice ‐based temperature reconstructions. These contrasting responses were explored using stable hydrogen isotopes in water vapor (δD v ). We found that the interannual variation in δD v from the northern TP is influenced by midtropospheric moisture sources from the Indo‐Pacific Warm Pool, with enriched (depleted) δD v values in La Niña (El Niño) years due to enhanced (weakened) deep convection. In comparison, the interannual δD v variation in the southern TP is mainly influenced by low‐tropospheric moisture from the central Indian Continent, whose δD v is depleted (enriched) in La Niña (El Niño) years. These results demonstrate that moisture transported from different altitudes can lead to opposite isotopic signals of water vapor over the northern and southern TP and can be used to reconcile the contrasting responses of δ 18 O ice to ENSO.
Publisher: Springer Science and Business Media LLC
Date: 28-07-2022
DOI: 10.1038/S41467-022-32172-9
Abstract: Stable isotope paleoaltimetry that reconstructs paleoelevation requires stable isotope (δD or δ 18 O) values to follow the altitude effect. Some studies found that the δD or δ 18 O values of surface isotopic carriers in some regions increase with increasing altitude, which is defined as an “inverse altitude effect” (IAE). The IAE directly contradicts the basic theory of stable isotope paleoaltimetry. However, the causes of the IAE remain unclear. Here, we explore the mechanisms of the IAE from an atmospheric circulation perspective using δD in water vapor on a global scale. We find that two processes cause the IAE: (1) the supply of moisture with higher isotopic values from distant source regions, and (2) intense lateral mixing between the lower and mid-troposphere along the moisture transport pathway. Therefore, we caution that the influences of those two processes need careful consideration for different mountain uplift stages before using stable isotope palaeoaltimetry.
Publisher: Oxford University Press (OUP)
Date: 06-2001
Publisher: American Geophysical Union (AGU)
Date: 07-03-2023
DOI: 10.1029/2022GL102229
Abstract: Stable hydrogen isotopes in monsoonal precipitation (δD p ) at three sites (Port Blair, Barisal and Darjeeling) reveal the factors governing δD p variations over a south‐north gradient across the Bay of Bengal. We found that the δD p at each site continuously decreases from May to September and these trends become more pronounced from south to north. The decreasing trends of downstream δD p closely follow the decreasing trends of upstream stable hydrogen isotopes in water vapor (δD v ), which indicates that upstream δD v properties shape initial spatiotemporal patterns of the downstream δD p (“shaping effect”). Additionally, our results demonstrate that, during moisture transport, upstream vertical air motions (convection and downward motion) and topographic relief magnify the litude of the decreasing trends of downstream δD p (“magnifying effect”). Our findings imply that upstream δD v properties and relevant atmospheric and topographical conditions along the moisture transport pathway need to be considered collectively to better interpret paleoclimate records.
Publisher: Wiley
Date: 12-04-2022
DOI: 10.1111/NPH.18113
Abstract: We compiled hydrogen and oxygen stable isotope compositions (δ 2 H and δ 18 O) of leaf water from multiple biomes to examine variations with environmental drivers. Leaf water δ 2 H was more closely correlated with δ 2 H of xylem water or atmospheric vapour, whereas leaf water δ 18 O was more closely correlated with air relative humidity. This resulted from the larger proportional range for δ 2 H of meteoric waters relative to the extent of leaf water evaporative enrichment compared with δ 18 O. We next expressed leaf water as isotopic enrichment above xylem water (Δ 2 H and Δ 18 O) to remove the impact of xylem water isotopic variation. For Δ 2 H, leaf water still correlated with atmospheric vapour, whereas Δ 18 O showed no such correlation. This was explained by covariance between air relative humidity and the Δ 18 O of atmospheric vapour. This is consistent with a previously observed diurnal correlation between air relative humidity and the deuterium excess of atmospheric vapour across a range of ecosystems. We conclude that 2 H and 18 O in leaf water do indeed reflect the balance of environmental drivers differently our results have implications for understanding isotopic effects associated with water cycling in terrestrial ecosystems and for inferring environmental change from isotopic biomarkers that act as proxies for leaf water.
Publisher: Wiley
Date: 09-08-2013
DOI: 10.1002/JOC.3799
Publisher: Elsevier BV
Date: 11-2017
Location: China
No related grants have been discovered for Wusheng Yu.