4DVD visualization and delivery of the 20th century reanalysis data: methods and examples
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ORIGINAL PAPER
4DVD visualization and delivery of the 20th century reanalysis data: methods and examples Samuel S. P. Shen 1,2
&
Julien Pierret 1 & Isaiah Dorado 1 & Snehal Ilawe 1
Received: 21 February 2020 / Accepted: 1 June 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract This paper describes the use of a web application system, called 4-Dimensional Visual Delivery (4DVD), to visualize and deliver climate data. The focus of this paper is on the monthly data from the NOAA-CIRES-DOE Twentieth Century Reanalysis (20CR) project Version 2c. The 20CR is a global model at a spatial resolution about 2° latitude-longitude. The temporal coverage is from January 1851 to December 2014. The monthly data include numerous climate variables, such as temperature, pressure, precipitation rate, zonal wind, meridional wind, albedo, and longwave radiation flux. We show how to use the 4DVD system to conveniently visualize, deliver, and analyze the 20CR data of these parameters on a globe or on a 2D latitude-longitude map. We analyze the temporal and spatial patterns of zonal wind and precipitation over Niño 4 region (5° N-5° S, 160° E-150° W). The monthly NASA Global Precipitation Climatology Project (GPCP) data are used to compare the results from 20CR. GPCP data used in this 4DVD application are defined on 2.5° latitude-longitude grid boxes from January 1979 to January 2019. The 4DVD figures successfully show the reverse of zonal wind direction from the east-to-west wind to the west-to-east wind on the grid box (2° S, 176° W) in the Niño 4 region during an El Niño event. The spectral analysis shows the annual and semi-annual cycles in the zonal wind data on this grid box. The GPCP data are used to support the analysis results of 20CR zonal data. The precipitation data over the grid box (1.25° S, 176.25° W) in the Niño 4 region show clear El Niño signals (persistent extreme precipitation more than 6 mm/day) and clear La Niña signals (persistent “dry” with near-zero precipitation). The spectral analysis of the precipitation data time series over this grid box shows no annual cycle.
1 Introduction Visualization and fast delivery of the space-time climate data are desirable to both climate science professionals and the general public. The web application system 4-Dimensional Visual Delivery (4DVD) (www.4dvd.org) was originally for this purpose (Pierret 2018; Pierret and Shen 2017). The objective of this paper is to explore the use of 4DVD to visualize, analyze, and deliver the monthly data from the NOAACIRES-DOE Twentieth Century Reanalysis (20CR) project (Version 2c) (Compo et al. 2006, 2011) downloaded from the NOAA Earth System Research Lab (ESRL) data repository. * Samuel S. P. Shen [email protected] 1
Department of Mathematics and Statistics, San Diego State University, San Diego, CA, USA
2
Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
(https://www.esrl.noaa.gov/psd/data/gridded/index.html). For the purpose of comparing climate model data with observatio
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