scholarly journals Response of Carbon Dynamics to Climate Change Varied among Different Vegetation Types in Central Asia

2018 ◽  
Vol 10 (9) ◽  
pp. 3288 ◽  
Author(s):  
Qifei Han ◽  
Geping Luo ◽  
Chaofan Li ◽  
Shoubo Li
Keyword(s):  
Climate Change ◽  
Central Asia ◽  
Net Primary Productivity ◽  
Climate Adaptation ◽  
Carbon Dynamics ◽  
The Other ◽  
Vegetation Types ◽  
Climate Data ◽  
A Value ◽  
Spatio Temporal

The effect of climate change on the spatio-temporal patterns of the terrestrial carbon dynamics in Central Asia have not been adequately quantified despite its potential importance to the global carbon cycle. Therefore, the modified BioGeochemical Cycles (Biome-BGC) model was applied in this study to evaluate the impacts of climatic change on net primary productivity (NPP) and net ecosystem productivity. Four vegetation types were studied during the period 1979 to 2011: cropland, grassland, forest, and shrubland. The results indicated that: (1) The climate data showed that Central Asia experienced a rise in annual mean temperature and a decline in precipitation from 1979 to 2011; (2) the mean NPP for Central Asia in 1979–2011 was 281.79 gC m−2 yr−1, and the cropland had the highest NPP compared with the other vegetation types, with a value of 646.25 gC m−2 yr−1; (3) grassland presented as a carbon source (−0.21 gC m−2 yr−1), whereas the other three types were carbon sinks; (4) the four vegetation types showed similar responses to climate variation during the past 30 years, and grassland is the most sensitive ecosystem in Central Asia. This study explored the possible implications for climate adaptation and mitigation.

scholarly journals Effects of climatic factors on the net primary productivity in the source region of Yangtze River, China

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhe Yuan ◽  
Yongqiang Wang ◽  
Jijun Xu ◽  
Zhiguang Wu
Keyword(s):  
Climate Change ◽  
Primary Productivity ◽  
Yangtze River ◽  
Net Primary Productivity ◽  
Climatic Factors ◽  
Source Region ◽  
Primary Reason ◽  
Vegetation Types ◽  
Temperature And Precipitation ◽  
Increasing Trend

AbstractThe ecosystem of the Source Region of Yangtze River (SRYR) is highly susceptible to climate change. In this study, the spatial–temporal variation of NPP from 2000 to 2014 was analyzed, using outputs of Carnegie–Ames–Stanford Approach model. Then the correlation characteristics of NPP and climatic factors were evaluated. The results indicate that: (1) The average NPP in the SRYR is 100.0 gC/m2 from 2000 to 2014, and it shows an increasing trend from northwest to southeast. The responses of NPP to altitude varied among the regions with the altitude below 3500 m, between 3500 to 4500 m and above 4500 m, which could be attributed to the altitude associated variations of climatic factors and vegetation types; (2) The total NPP of SRYR increased by 0.18 TgC per year in the context of the warmer and wetter climate during 2000–2014. The NPP was significantly and positively correlated with annual temperature and precipitation at interannual time scales. Temperature in February, March, May and September make greater contribution to NPP than that in other months. And precipitation in July played a more crucial role in influencing NPP than that in other months; (3) Climatic factors caused the NPP to increase in most of the SRYR. Impacts of human activities were concentrated mainly in downstream region and is the primary reason for declines in NPP.

scholarly journals Quality Assessment of PROBA-V Surface Albedo V1 for the Continuity of the Copernicus Climate Change Service

2020 ◽  
Vol 12 (16) ◽  
pp. 2596
Author(s):  
Jorge Sánchez-Zapero ◽  
Fernando Camacho ◽  
Enrique Martínez-Sánchez ◽  
Roselyne Lacaze ◽  
Dominique Carrer ◽  
...  
Keyword(s):  
Climate Change ◽  
Surface Albedo ◽  
Near Infrared ◽  
Accuracy Assessment ◽  
Performance Criteria ◽  
Climate Data ◽  
Residual Noise ◽  
Space Agency ◽  
Median Error ◽  
Spatio Temporal

The Copernicus Climate Change Service (C3S) includes estimates of Essential Climate Variables (ECVs) as a series of Climate Data Records (CDRs) derived from satellite data. The C3S Surface Albedo (SA) v1.0 CDR is composed of observations from National Oceanic and Atmospheric Administration (NOAA) Very High Resolution Radiometers (AVHRR) (1981–2005), and VEGETATION sensors onboard Satellites for the Observation of the Earth (SPOT/VGT) (1998–2014) and Project for Onboard Autonomy satellite (PROBA-V) (2014–2020), and will continue with Sentinel-3 (from 2020 onwards). The goal of this study is to assess the uncertainties associated with the C3S PROBA-V SA v1.0 product, with a focus on the transition from SPOT/VGT to PROBA-V. The methodology followed the good practices recommended by the Land Product Validation sub-group (LPV) of the Working Group on Calibration and Validation (WGCV) of the Committee on Earth Observing Satellites (CEOS) for the validation of satellite-derived global albedo products. Several performance criteria were evaluated, including an intercomparison with National Aeronautics and Space Agency (NASA) MCD43A3 C6 products. C3S PROBA-V SA v1.0 and MCD43A3 C6 showed similar completeness but had higher fractions of missing data than C3S SPOT/VGT SA v1.0. C3S PROBA-V SA v1.0 showed similar precision (~1%) to MCD43A3 C6, improving the results of SPOT/VGT SA v1.0 (2–3%), but C3S PROBA-V SA v1.0 provided residual noise in the near-infrared (NIR). Good spatio-temporal continuity between C3S PROBA-V and SPOT/VGT SA v1.0 products was found with a mean bias between ±2%. The comparison with MCD43A3 C6 showed positive mean biases (5%, 8%, and 12% for visible, NIR and total shortwave, respectively). The accuracy assessment with ground measurements showed a median error of 18.4% with systematic overestimation (positive bias of 11.5%). The percentage of PROBA-V retrievals complying with the C3S target requirements was 28.6%.

scholarly journals Seeing Climate Change: A Framework for Understanding Visualizations for Climate Adaptation

2020 ◽  
Vol 9 (11) ◽  
pp. 644
Author(s):  
Alexei Goudine ◽  
Robert Newell ◽  
Christopher Bone
Keyword(s):  
Climate Change ◽  
Climate Adaptation ◽  
Use Case ◽  
Climate Data ◽  
Expert User ◽  
Theoretical Inquiry ◽  
User Groups ◽  
Rapid Pace ◽  
Research Gap ◽  
Effective Visualization

Climate change has resulted in the need for adaptation tools to provide stakeholders with the ability to respond to a broad range of potential impacts. Geovisualizations serve as powerful engagement tools due to their capacity in communicating complex climate data to various audiences. Studies have also shown a preference towards conveying climate data through geo-visual representations, to quickly present ideas rooted in geographical challenges and solutions. However, a rapid pace of technological advancements has paved the way for an abundance of geovisualization products that have eclipsed the necessary theoretical inquiry and knowledge required to establish effective visualization principles. This study addresses this research gap through a two-step process of (1) conducting a thorough review of the geovisualization for climate change literature, and (2) creating a conceptual framework that classifies existing geovisualization products into themes relating to visualization features, audiences, and the intended outcome or purpose of the visualization medium. The result is the Climate Visualizations for Adaptation Products (CVAP) framework, a tool for researchers and practitioners to use as a decision support system to discern an appropriate type of geovisualization product to implement within a specific use case or audience. Visualizations with more interactivity were favoured among expert user groups, to act as tools for knowledge discovery. This is contrary to the visualizations intended for communicating a known message to a user group, as those products often had a low level of interactivity associated with their use.

The impact of climate change on Canadian archives

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Amanda Oliver
Keyword(s):  
Climate Change ◽  
Climate Adaptation ◽  
Disaster Planning ◽  
Adaptation Strategies ◽  
Records Management ◽  
Climate Data ◽  
Content Type ◽  
Impact Of Climate Change ◽  
Projected Changes ◽  
The Impact

Purpose This study aims to identify Canadian archives that are at risk for climate change threats, to present a snapshot of current practices around disaster planning, sustainability and climate adaptation and to provide recommended next steps for records managers and archivists adapting to climate change. Design/methodology/approach These objectives were achieved by analyzing the geographic locations of Canadian archives in relation to projected climate data and by analyzing the results of a survey distributed to staff at Canadian archival repositories. Findings This study found that all Canadian archives will be impacted by projected changes in both annual mean temperatures and precipitation to the year 2080. Themes that emerged surrounding climate adaptation strategies include the investment in the design and efficiency of spaces housing records and the importance of resilient buildings, the need for increased training on climate change, engaging senior leadership and administrators on climate change and developing regional strategies. Preparing for and mitigating the impact of climate change on the facilities and holdings needs to become a priority. Originality/value This research underscores the importance of developing climate adaptation strategies, considering the sustainability of records management and archival professional practice, increasing the resilience of the facilities and records and strengthening the disaster planning and recovery methods.

scholarly journals An ecological ‘footprint’ of climate change

2005 ◽  
Vol 272 (1571) ◽  
pp. 1427-1432 ◽  
Author(s):  
Gian-Reto Walther ◽  
Silje Berger ◽  
Martin T Sykes
Keyword(s):  
Climate Change ◽  
Species Distribution ◽  
Global Climate ◽  
Ground Truth ◽  
Warming Trend ◽  
Climate Data ◽  
Northern Margin ◽  
Winter Temperatures ◽  
Bioclimatic Model ◽  
Spatio Temporal

Recently, there has been increasing evidence of species' range shifts due to changes in climate. Whereas most of these shifts relate ground truth biogeographic data to a general warming trend in regional or global climate data, we here present a reanalysis of both biogeographic and bioclimatic data of equal spatio-temporal resolution, covering a time span of more than 50 years. Our results reveal a coherent and synchronous shift in both species' distribution and climate. They show not only a shift in the northern margin of a species, which is in concert with gradually increasing winter temperatures in the area, they also confirm the simulated species' distribution changes expected from a bioclimatic model under the recent, relatively moderate climate change.

scholarly journals Contemporary perspectives on the niche that can improve models of species range shifts under climate change

2008 ◽  
Vol 4 (5) ◽  
pp. 573-576 ◽  
Author(s):  
Xavier Morin ◽  
Martin J Lechowicz
Keyword(s):  
Climate Change ◽  
Species Distribution ◽  
Spatial Scales ◽  
Climate Change Impacts ◽  
Community Diversity ◽  
Vegetation Types ◽  
Heterogeneous Landscapes ◽  
Niche Concept ◽  
Spatio Temporal ◽  
Effective Models

Pioneering efforts to predict shifts in species distribution under climate change used simple models based on the correlation between contemporary environmental factors and distributions. These models make predictions at coarse spatial scales and assume the constancy of present correlations between environment and distribution. Adaptive management of climate change impacts requires models that can make more robust predictions at finer spatio-temporal scales by accounting for processes that actually affect species distribution on heterogeneous landscapes. Mechanistic models of the distribution of both species and vegetation types have begun to emerge to meet these needs. We review these developments and highlight how recent advances in our understanding of relationships among the niche concept, species diversity and community assembly point the way towards more effective models for the impacts of global change on species distribution and community diversity.

scholarly journals Impact of droughts on the C-cycle in European vegetation: a probabilistic risk analysis using six vegetation models

2014 ◽  
Vol 11 (6) ◽  
pp. 8325-8371 ◽  
Author(s):  
M. Van Oijen ◽  
J. Balkovič ◽  
C. Beer ◽  
D. Cameron ◽  
P. Ciais ◽  
...  
Keyword(s):  
Climate Change ◽  
Risk Analysis ◽  
Net Primary Productivity ◽  
Climate Model ◽  
Grid Cell ◽  
Climate Data ◽  
Drought Vulnerability ◽  
Ecosystem Vulnerability ◽  
C Cycle ◽  
Vegetation Models

Abstract. We analyse how climate change may alter risks posed by droughts to carbon fluxes in European ecosystems. The approach follows a recently proposed framework for risk analysis based on probability theory. In this approach, risk is quantified as the product of hazard probability and ecosystem vulnerability. The probability of a drought hazard is calculated here from the Standardised Precipitation Evapotranspiration Index. Vulnerability is calculated from the response to drought simulated by process-based vegetation models. Here we use six different models: three for generic vegetation (JSBACH, LPJmL, ORCHIDEE) and three for specific ecosystems (Scots pine forests: BASFOR; winter wheat fields: EPIC; grasslands: PASIM). The periods 1971–2000 and 2071–2100 are compared. Climate data are based on observations and on output from the regional climate model REMO using the SRES A1B scenario. The risk analysis is carried out for ∼22 000 grid cells of 0.25° × 0.25° across Europe. For each grid cell, drought vulnerability and risk are quantified for five seasonal variables: net primary and ecosystem productivity (NPP, NEP), heterotrophic respiration (RH), soil water content and evapotranspiration. Climate change is expected to lead to increased drought risks to net primary productivity in the Mediterranean area: five of the models estimate that risk will exceed 15%. The risks will increase mainly because of greater drought probability; ecosystem vulnerability will increase to lesser extent. Because NPP will be affected more than RH, future C-sequestration (NEP) will also be at risk predominantly in southern Europe, with risks exceeding 0.25 g C m−2 d−1 according to most models, amounting to reductions in carbon sequestration of 20 to 80%.

scholarly journals Ice-front change and iceberg behaviour along Oates and George V Coasts, Antarctica, 1912-96

1998 ◽  
Vol 27 ◽  
pp. 643-650 ◽  
Author(s):  
Massimo Frezzotti ◽  
Alessandro Cimbelli ◽  
Jane G. Ferrigno
Keyword(s):  
Climate Change ◽  
Drainage Basin ◽  
Regional Climate ◽  
Satellite Image ◽  
Regional Climate Change ◽  
The Other ◽  
Ice Shelf ◽  
A Value ◽  
Iceberg Calving ◽  
Satellite Image Analysis

Ice-front change may well be a sensitive indicator of regional climate change. We have studied the western Oates Coast from Cape Kinsey (158°50' E, 69°19' S) to Cape Hudson (153°45' Ε, 68°20' S) and the entire George V Coast, from Cape Hudson to Point Alden (142°02' E, 66°48' S). The glaciers here drain part of the Dome Charlie and Talos Dome areas (640 000 km2). A comparison between various documents, dated several years apart, has allowed an estimate of the surficial ice discharge, the ice-front fluctuation and the iceberg-calving flux during the last 50 years. The ice-front discharge of the studied coast has been estimated at about 90 ± 12 km3a−1 in 1989-91, 8.5 km3a−1 for western Oates Coast and 82 km3a−1 for George V Coast. From 1962-63 to 1973-74 the floating glaciers underwent a net reduction that continued from 1973-74 to 1989-91. On the other hand, from 1989-91 to 1996 the area of floating glaciers increased. Ninnis Glacier Tongue and the western part of Cook Ice Shelf underwent a significant retreat after 1980 and 1947, respectively. Satellite-image analysis of large icebergs has provided information about ice-ocean interaction and the existence of an “iceberg trap” along George V Coast. A first estimate of the mass balance of the drainage basin of Mertz and Ninnis Glaciers shows a value close to zero or slightly negative.

scholarly journals Spatio-Temporal Analysis of Historical and Future Climate Data in the Texas High Plains

2020 ◽  
Vol 12 (15) ◽  
pp. 6036
Author(s):  
Yong Chen ◽  
Gary W. Marek ◽  
Thomas H. Marek ◽  
Dana O. Porter ◽  
Jerry E. Moorhead ◽  
...  
Keyword(s):  
Climate Change ◽  
General Circulation ◽  
General Circulation Models ◽  
Quality Data ◽  
High Plains ◽  
Climate Change Scenarios ◽  
Climate Data ◽  
Air Temperatures ◽  
Texas High Plains ◽  
Spatio Temporal

Agricultural production in the Texas High Plains (THP) relies heavily on irrigation and is susceptible to drought due to the declining availability of groundwater and climate change. Therefore, it is meaningful to perform an overview of possible climate change scenarios to provide appropriate strategies for climate change adaptation in the THP. In this study, spatio-temporal variations of climate data were mapped in the THP during 2000–2009, 2050–2059, and 2090–2099 periods using 14 research-grade meteorological stations and 19 bias-corrected General Circulation Models (GCMs) under representative concentration pathway (RCP) scenarios RCP 4.5 and 8.5. Results indicated different bias correction methods were needed for different climatic parameters and study purposes. For example, using high-quality data from the meteorological stations, the linear scaling method was selected to alter the projected precipitation while air temperatures were bias corrected using the quantile mapping method. At the end of the 21st century (2090–2099) under the severe CO2 emission scenario (RCP 8.5), the maximum and minimum air temperatures could increase from 3.9 to 10.0 °C and 2.8 to 8.4 °C across the entire THP, respectively, while precipitation could decrease by ~7.5% relative to the historical (2000–2009) observed data. However, large uncertainties were found according to 19 GCM projections.

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