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Weather and climate influence every sector of society. Changes in the climate can influence economic prosperity, human and environmental health, and national security. Citizens, communities, businesses, governments, and international organizations are demanding climate information and products to cope with climate variability and to adapt to and mitigate climate change. ARL provides essential information and tools for decision-makers to understand how and why climate has changed and what changes might occur in the future. National and international climate scientists and decision-makers use ARL's information to understand climate trends and the need for mitigating and adapting to climate change.
A graphical display of climate change variables.
What We Do
ARL's Climate Research concentrates on developing reference observing systems to meet climate requirements and analyzing long-term observational datasets to understand climate variability and change on diurnal to multi-decadal time scales. Our products and services are used by national and international scientists and decision-makers to understand climate trends and the need for mitigating and adapting to climate change. Our research has contributed to a number of climate change assessments, including the work of the Intergovernmental Panel on Climate Change, the U.S Global Change Research Program, and international assessments of stratospheric ozone depletion.
Until recently, data for analysis of climate change were essentially compilations of archived weather observations that lacked long-term quality and continuity essential for clearcut identification of climate trends. Changes in instruments, methods, station locations, and data processing procedures all introduce biases that could be mistaken for, or mask, real climate changes. Now, it is recognized that dedicated climate reference observing networks are needed both to monitor climate change in situ and to calibrate measurements collected from other observing systems, such as satellites, to make data more suitable for climate work.
An ARL technician checking equipment at the Climate Reference Network Site in Wolf Point, MT. Photo: NOAA
ARL contributes to two land-based climate reference networks, the U.S. Climate Reference Network and the Regional U.S. Climate Reference Network, through the design, establishment, operation, maintenance, and analysis of these observing systems. ARL also provides scientific leadership and research for the establishment of an upper air climate reference network, called the Global Climate Observing System Reference Upper-Air Network.
ARL's climate measurement expertise is also used to support the Surface Energy Budget Network. This network is a consolidation of several independent but closely related observing systems into a single, costeffective and efficient network that seeks to explain why climate variables (e.g., air temperature, precipitation) have changed. Data are used to provide detailed examination of the land-surface feedbacks and related radiative processes that can drive regional climate. Data are also used to improve weather predictions.
Climate Variability and Change Analysis
ARL analyzes daily to multi-decadal atmospheric variations measured by many types of climate observation systems, with a special emphasis on radiosonde (weather balloon) data. ARL's radiosonde research has identified important data problems and produced new, improved datasets by removing artificial, non-physical signals from weather observations. ARL uses these and other datasets to identify and characterize climate variability and trends. Through collaboration with climate modeling groups, ARL's datasets are used to evaluate global climate models.
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