Multi-Satellite Volcanic Sulfur Dioxide L4 Long-Term Global Database V4 (MSVOLSO2L4) at GES DISC

Version 4 is the current version of the data set. Older versions are no longer available and have been superseded by Version 4.

These data are a part of MEaSUREs 2012 projects. The particular project, "Multi-Decadal Sulfur Dioxide Climatology from Satellite Instruments", is expected to produce SO2 Earth Science Data Record by means of combining measurements from backscatter Ultraviolet (BUV), thermal infrared (IR) and microwave (MLS) instruments on multiple satellites. The data represent best estimates of the volcanic and anthropogenic contribution to global atmospheric SO2 concentrations. Since SO2 is the major precursor of sulfate aerosol, which has climate and air quality impact, SO2 measurements will contribute to better understanding of the sulfate aerosol distributions and its atmospheric impact."

The released data file is a long-term database of volcanic SO2 emission derived from ultraviolet satellite measurements from October 31, 1978, to present.

Data are in a table format in simple ASCII format:

Column Descriptions:
Column 1 = Name of volcano.
Column 2 = Latitude of volcano.
Column 3 = Longitude of volcano.
Column 4 = Altitude of volcano (km).
Column 5 = Eruption year.
Column 6 = Eruption month of year.
Column 7 = Eruption day of month.
Column 8 = Eruption style: exp = explosive, eff = effusive.
Column 9 = Eruption volcanic explosivity index (nd = no data or undetermined).
Column 10 = Observed plume altitude (km) where known.
Column 11 = Estimated plume altitude (km) above vent: 10 km for explosive, 5 km for effusive.
Column 12 = Measured SO2 mass in kilotons (= 1000 metric tons).

版本4为本数据集当前最新版本，旧版本已停止提供，由版本4取代。

本数据集隶属于MEaSUREs 2012项目，其中具体研究项目为“多十年卫星仪器二氧化硫气候学研究（Multi-Decadal Sulfur Dioxide Climatology from Satellite Instruments）”。该项目计划通过整合多颗卫星搭载的后向散射紫外（backscatter Ultraviolet, BUV）、热红外（thermal infrared, IR）及微波（MLS）仪器的观测数据，生成二氧化硫地球科学数据记录（SO2 Earth Science Data Record）。

本数据为全球大气二氧化硫浓度中火山与人为贡献的最优估算值。由于二氧化硫是硫酸盐气溶胶的主要前体物，而硫酸盐气溶胶会对气候与空气质量产生影响，因此二氧化硫观测数据将有助于更深入地理解硫酸盐气溶胶的分布及其大气影响。

本次发布的数据文件为1978年10月31日至今、基于紫外卫星观测得到的长期火山二氧化硫排放数据库。

数据采用简易ASCII格式的表格形式存储，各列说明如下：
列1：火山名称
列2：火山纬度
列3：火山经度
列4：火山海拔（单位：千米）
列5：喷发年份
列6：喷发月份
列7：喷发日期
列8：喷发类型：exp为爆发式喷发（explosive），eff为溢流式喷发（effusive）
列9：火山喷发爆发指数（nd表示无数据或未确定）
列10：有记录的观测喷发柱高度（单位：千米）
列11：估算的火山口上方喷发柱高度：爆发式喷发取10千米，溢流式喷发取5千米
列12：实测二氧化硫质量，单位为千吨（即1000公吨）