Xiyan Xu
Biographic Data
| ID | 6823111 |
|---|---|
| NAME | Xiyan Xu |
| GIVEN NAMES | Xiyan |
| FAMILY NAME | Xu |
| SIGNATURE | XU X |
| AFFILIATIONS | Chinese Academy of Sciences |
| ORCID | 0000-0003-2732-1325 |
| VERIFIED | Yes |
| TOTAL WORKS | 15 |
| TOTAL CITATIONS | 0 |
| AUTHOR COUNT | 15 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2010 |
| LATEST PUBLICATION YEAR | 2025 |
| H-INDEX | 0 |
Soil moisture dominates the severe decline in gross primary productivity during a 2023–2024 compound heatwave-drought event over the Amazon
The Amazon, the world’s largest tropical forest, plays a critical role in the global carbon cycle. It has a large carbon pool and acts as a major carbon sink. However, in 2023–2024, a compound heatwave-drought (CHWD) event (HD2023) hit the Amazon region, resulting in extreme temperatures and soil moisture deficits, threatening the region’s carbon sink capacity. Using advanced multisource satellite data and meteorological reanalysis, we quantified…
Displacement of Intertropical Convergence Zone induced by interannual variability in biomass burning aerosol emissions
Biomass burning (BB) aerosols affect Earth’s climate through total emissions and their interannual variability. Using the Community Earth System Model version 2 Large Ensemble Community Project, we investigate the impact of BB variability on the tropical climate response. High BB variability leads to increased precipitation and a southward shift of the Intertropical Convergence Zone (ITCZ) in the central Pacific (CP) and western Pacific (WP), but…
Changes in fire-season burned area in northeastern China regulated by tropical North Atlantic variability
Mapping and monitoring regional fire activity are essential to understand their responses to human activities and climate change. Here we use multiple sources of observations, reanalysis data, and model simulations to examine the responses of fire activity to climate change over northeastern China in the past two decades. We detected significant positive burned area (BA) trends in this region since 2003 during spring and much stronger interannual…
Recent massive expansion of wildfire and its impact on active layer over pan-Arctic permafrost
Wildfire is recognized as an increasing threat to the southern boreal forests and the permafrost beneath them, with less occurring over the cold continuous permafrost than before. However, we show that continuous permafrost was a major contribution to wildfire expansion in the pan-Arctic over the last two decades. The expansion rate of burned area over continuous permafrost was 0.9 Mha decade −1 , in contrast to a decreasing trend (−0.5 Mha decad…
Serengeti–Masai Mara ecosystem dynamics inferred from rainfall extremes
The Serengeti–Masai Mara Ecosystem (SMME) is an iconic ecological and biodiversity resource in East Africa with a spectacular great animal migration feature. Environmental shocks like droughts, floods, and land degradation threaten the SMME’s ecological functioning. However, the spatiotemporal ecosystem dynamics during climate extremes are inadequately examined. Here we quantified water availability and vegetation changes during extreme wet (EWE)…
Green Space Cooling Effect and Contribution to Mitigate Heat Island Effect of Surrounding Communities in Beijing Metropolitan Area
With the rapid process of urbanization and global warming, many metropolises are vulnerable to high temperatures in summer, threatening the health of residents. However, green spaces can generate a cooling effect to mitigate the urban heat island effect in big cities. They can also help to improve the living quality and wellbeing of surrounding residents. In this paper, we utilized the radiative transfer equation algorithm, k-means clustering alg…
Effect of the spatial form of Jiangnan traditional villages on microclimate and human comfort
Asymmetrical cooling effects of Amazonian protected areas across spatiotemporal scales
Amazonian protected areas (PAs) play an important role in maintaining the regional and global ecosystem services, biodiversity and climate change mitigation. The effects of Amazonian PAs on climate change mitigation mainly focus on the carbon sequestration benefits. The biophysical effects of PAs on regulating the local energy budgets, and hence changing local climate, however, are often ignored. Using multiple satellite observation datasets, we …
Deforestation triggering irreversible transition in Amazon hydrological cycle
The Amazon is hypothesized to reach an irreversible ‘tipping point’ when deforestation slows the hydrological cycle sufficiently that tropical forest ecosystems cannot be sustained. However, inception of such a tipping point has not been supported by observations and the relevant links between deforestation and atmospheric moisture recycling are poorly understood. Here we show that reduction in evapotranspiration from 20 years of deforestation dr…
Enhanced nighttime heatwaves over African urban clusters
Despite the threat that nighttime heatwave poses to public health and the environment in the developing world, it remains relatively understudied in Africa, especially in its rapidly expanding urban areas with large populations. Using meteorological observations, climate reanalysis, remote sensing datasets, and integrated methodology, we found that during 1981–2020, nighttime heatwaves dramatically increased with early onset dates over Africa. La…
Reforestation enhanced landscape connectivity for thermal buffering in China
Deforestation-induced landscape fragmentation causes habitat loss and isolation, modifies local climate, and therefore threatens biodiversity. While, on the contrary, how large-scale reforestation may improve the connectivity and thermal buffers of habitats is not well understood. We show that decades long large-scale reforestation in China has effectively increased the size and connectivity of forest patches by gradually filling gaps among isola…
A ten-year China-US laboratory collaboration: Improving response to influenza threats in China and the world, 2004–2014
The emergence of severe acute respiratory syndrome (SARS) underscored the importance of influenza detection and response in China. From 2004, the Chinese National Influenza Center (CNIC) and the United States Centers for Disease Control and Prevention (USCDC) initiated Cooperative Agreements to build capacity in influenza surveillance in China.From 2004 to 2014, CNIC and USCDC collaborated on the following activities: 1) developing human technica…
Global wetland contribution to 2000–2012 atmospheric methane growth rate dynamics
Increasing atmospheric methane (CH 4 ) concentrations have contributed to approximately 20% of anthropogenic climate change. Despite the importance of CH 4 as a greenhouse gas, its atmospheric growth rate and dynamics over the past two decades, which include a stabilization period (1999–2006), followed by renewed growth starting in 2007, remain poorly understood. We provide an updated estimate of CH 4 emissions from wetlands, the largest natural …
Climate extremes and grassland potential productivity
The considerable interannual variability (IAV) (~5 PgC yr−1) observed in atmospheric CO2 is dominated by variability in terrestrial productivity. Among terrestrial ecosystems, grassland productivity IAV is greatest. Relationships between grassland productivity IAV and climate drivers are poorly explained by traditional multiple-regression approaches. We propose a novel method, the perfect-deficit approach, to identify climate drivers of grassland…
Climate control of terrestrial carbon exchange across biomes and continents
Understanding the relationships between climate and carbon exchange by terrestrial ecosystems \nis critical to predict future levels of atmospheric carbon dioxide because of the potential \naccelerating effects of positive climate–carbon cycle feedbacks. However, directly observed \nrelationships between climate and terrestrial CO2 exchange with the atmosphere across biomes \nand continents are lacking. Here we present data describing the relatio…
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Climate control of terrestrial carbon exchange across biomes and continents
Understanding the relationships between climate and carbon exchange by terrestrial ecosystems \nis critical to predict future levels of atmospheric carbon dioxide because of the potential \naccelerating effects of positive climate–carbon cycle feedbacks. However, directly observed \nrelationships between climate and terrestrial CO2 exchange with the atmosphere across biomes \nand continents are lacking. Here we present data describing the relatio…
Climate extremes and grassland potential productivity
The considerable interannual variability (IAV) (~5 PgC yr−1) observed in atmospheric CO2 is dominated by variability in terrestrial productivity. Among terrestrial ecosystems, grassland productivity IAV is greatest. Relationships between grassland productivity IAV and climate drivers are poorly explained by traditional multiple-regression approaches. We propose a novel method, the perfect-deficit approach, to identify climate drivers of grassland…
Global wetland contribution to 2000–2012 atmospheric methane growth rate dynamics
Increasing atmospheric methane (CH 4 ) concentrations have contributed to approximately 20% of anthropogenic climate change. Despite the importance of CH 4 as a greenhouse gas, its atmospheric growth rate and dynamics over the past two decades, which include a stabilization period (1999–2006), followed by renewed growth starting in 2007, remain poorly understood. We provide an updated estimate of CH 4 emissions from wetlands, the largest natural …
A ten-year China-US laboratory collaboration: Improving response to influenza threats in China and the world, 2004–2014
The emergence of severe acute respiratory syndrome (SARS) underscored the importance of influenza detection and response in China. From 2004, the Chinese National Influenza Center (CNIC) and the United States Centers for Disease Control and Prevention (USCDC) initiated Cooperative Agreements to build capacity in influenza surveillance in China.From 2004 to 2014, CNIC and USCDC collaborated on the following activities: 1) developing human technica…
Reforestation enhanced landscape connectivity for thermal buffering in China
Deforestation-induced landscape fragmentation causes habitat loss and isolation, modifies local climate, and therefore threatens biodiversity. While, on the contrary, how large-scale reforestation may improve the connectivity and thermal buffers of habitats is not well understood. We show that decades long large-scale reforestation in China has effectively increased the size and connectivity of forest patches by gradually filling gaps among isola…
Green Space Cooling Effect and Contribution to Mitigate Heat Island Effect of Surrounding Communities in Beijing Metropolitan Area
With the rapid process of urbanization and global warming, many metropolises are vulnerable to high temperatures in summer, threatening the health of residents. However, green spaces can generate a cooling effect to mitigate the urban heat island effect in big cities. They can also help to improve the living quality and wellbeing of surrounding residents. In this paper, we utilized the radiative transfer equation algorithm, k-means clustering alg…
Effect of the spatial form of Jiangnan traditional villages on microclimate and human comfort
Asymmetrical cooling effects of Amazonian protected areas across spatiotemporal scales
Amazonian protected areas (PAs) play an important role in maintaining the regional and global ecosystem services, biodiversity and climate change mitigation. The effects of Amazonian PAs on climate change mitigation mainly focus on the carbon sequestration benefits. The biophysical effects of PAs on regulating the local energy budgets, and hence changing local climate, however, are often ignored. Using multiple satellite observation datasets, we …
Deforestation triggering irreversible transition in Amazon hydrological cycle
The Amazon is hypothesized to reach an irreversible ‘tipping point’ when deforestation slows the hydrological cycle sufficiently that tropical forest ecosystems cannot be sustained. However, inception of such a tipping point has not been supported by observations and the relevant links between deforestation and atmospheric moisture recycling are poorly understood. Here we show that reduction in evapotranspiration from 20 years of deforestation dr…
Enhanced nighttime heatwaves over African urban clusters
Despite the threat that nighttime heatwave poses to public health and the environment in the developing world, it remains relatively understudied in Africa, especially in its rapidly expanding urban areas with large populations. Using meteorological observations, climate reanalysis, remote sensing datasets, and integrated methodology, we found that during 1981–2020, nighttime heatwaves dramatically increased with early onset dates over Africa. La…
Recent massive expansion of wildfire and its impact on active layer over pan-Arctic permafrost
Wildfire is recognized as an increasing threat to the southern boreal forests and the permafrost beneath them, with less occurring over the cold continuous permafrost than before. However, we show that continuous permafrost was a major contribution to wildfire expansion in the pan-Arctic over the last two decades. The expansion rate of burned area over continuous permafrost was 0.9 Mha decade −1 , in contrast to a decreasing trend (−0.5 Mha decad…
Serengeti–Masai Mara ecosystem dynamics inferred from rainfall extremes
The Serengeti–Masai Mara Ecosystem (SMME) is an iconic ecological and biodiversity resource in East Africa with a spectacular great animal migration feature. Environmental shocks like droughts, floods, and land degradation threaten the SMME’s ecological functioning. However, the spatiotemporal ecosystem dynamics during climate extremes are inadequately examined. Here we quantified water availability and vegetation changes during extreme wet (EWE)…
Changes in fire-season burned area in northeastern China regulated by tropical North Atlantic variability
Mapping and monitoring regional fire activity are essential to understand their responses to human activities and climate change. Here we use multiple sources of observations, reanalysis data, and model simulations to examine the responses of fire activity to climate change over northeastern China in the past two decades. We detected significant positive burned area (BA) trends in this region since 2003 during spring and much stronger interannual…
Soil moisture dominates the severe decline in gross primary productivity during a 2023–2024 compound heatwave-drought event over the Amazon
The Amazon, the world’s largest tropical forest, plays a critical role in the global carbon cycle. It has a large carbon pool and acts as a major carbon sink. However, in 2023–2024, a compound heatwave-drought (CHWD) event (HD2023) hit the Amazon region, resulting in extreme temperatures and soil moisture deficits, threatening the region’s carbon sink capacity. Using advanced multisource satellite data and meteorological reanalysis, we quantified…
Displacement of Intertropical Convergence Zone induced by interannual variability in biomass burning aerosol emissions
Biomass burning (BB) aerosols affect Earth’s climate through total emissions and their interannual variability. Using the Community Earth System Model version 2 Large Ensemble Community Project, we investigate the impact of BB variability on the tropical climate response. High BB variability leads to increased precipitation and a southward shift of the Intertropical Convergence Zone (ITCZ) in the central Pacific (CP) and western Pacific (WP), but…
Environmental Science (14 works) · Geography (12 works) · Ecology (10 works) · Climate change (9 works) · Climatology (9 works) · Atmospheric sciences (7 works) · Geology (7 works) · Biology (6 works) · Climate variability and models (6 works) · Ecosystem (6 works)