netcdf BRDBBCMHII_1_17904646031838612252 { dimensions: time = 23725 ; variables: double time(time) ; time:standard_name = "time" ; time:long_name = "Time" ; time:axis = "T" ; time:units = "days since 1950-01-01 00:00:00" ; time:calendar = "proleptic_gregorian" ; byte BLT(time) ; string BLT:long_name = "Atmospheric Blocking Daily Index — Region BLT (Full domain)" ; BLT:units = "1" ; BLT:cell_methods = "time: point" ; BLT:comment = "Region BLT: lat 10S-25S, lon 60W-40W (Full domain). 1 = blocking day, 0 = no blocking; see global attribute \'methodology\' for the full criterion." ; byte BLN(time) ; string BLN:long_name = "Atmospheric Blocking Daily Index — Region BLN (Northern half)" ; BLN:units = "1" ; BLN:cell_methods = "time: point" ; BLN:comment = "Region BLN: lat 10S-17.5S, lon 60W-40W (Northern half). 1 = blocking day, 0 = no blocking; see global attribute \'methodology\' for the full criterion." ; byte BLN_h1(time) ; string BLN_h1:long_name = "Atmospheric Blocking Daily Index — Region BLN_h1 (Northern half, western sub-sector)" ; BLN_h1:units = "1" ; BLN_h1:cell_methods = "time: point" ; BLN_h1:comment = "Region BLN_h1: lat 10S-17.5S, lon 60W-50W (Northern half, western sub-sector). 1 = blocking day, 0 = no blocking; see global attribute \'methodology\' for the full criterion." ; byte BLN_h2(time) ; string BLN_h2:long_name = "Atmospheric Blocking Daily Index — Region BLN_h2 (Northern half, eastern sub-sector)" ; BLN_h2:units = "1" ; BLN_h2:cell_methods = "time: point" ; BLN_h2:comment = "Region BLN_h2: lat 10S-17.5S, lon 50W-40W (Northern half, eastern sub-sector). 1 = blocking day, 0 = no blocking; see global attribute \'methodology\' for the full criterion." ; byte BLS(time) ; string BLS:long_name = "Atmospheric Blocking Daily Index — Region BLS (Southern half)" ; BLS:units = "1" ; BLS:cell_methods = "time: point" ; BLS:comment = "Region BLS: lat 17.5S-25S, lon 60W-40W (Southern half). 1 = blocking day, 0 = no blocking; see global attribute \'methodology\' for the full criterion." ; byte BLS_h1(time) ; string BLS_h1:long_name = "Atmospheric Blocking Daily Index — Region BLS_h1 (Southern half, western sub-sector)" ; BLS_h1:units = "1" ; BLS_h1:cell_methods = "time: point" ; BLS_h1:comment = "Region BLS_h1: lat 17.5S-25S, lon 60W-50W (Southern half, western sub-sector). 1 = blocking day, 0 = no blocking; see global attribute \'methodology\' for the full criterion." ; byte BLS_h2(time) ; string BLS_h2:long_name = "Atmospheric Blocking Daily Index — Region BLS_h2 (Southern half, eastern sub-sector)" ; BLS_h2:units = "1" ; BLS_h2:cell_methods = "time: point" ; BLS_h2:comment = "Region BLS_h2: lat 17.5S-25S, lon 50W-40W (Southern half, eastern sub-sector). 1 = blocking day, 0 = no blocking; see global attribute \'methodology\' for the full criterion." ; // global attributes: :title = "Atmospheric Blocking Daily Index - CMIP6 BCC-CSM2-MR, historical" ; :summary = "Daily binary atmospheric blocking index (Cataldi et al. 2024 criterion) computed from CMIP6 BCC-CSM2-MR model output, Historical simulation (1950-2014). Seven sub-regions of the 10S-25S, 60W-40W domain (Brazil) are provided as separate variables: BLT (Full domain), BLN (Northern half), BLN_h1 (Northern half, western sub-sector), BLN_h2 (Northern half, eastern sub-sector), BLS (Southern half), BLS_h1 (Southern half, western sub-sector), BLS_h2 (Southern half, eastern sub-sector). Index values are binary: 1 = blocking day, 0 = no blocking. Temporal coverage: 1950-01-01 to 2014-12-31 (23725 days)." ; :keywords = "atmospheric blocking, drought, climate index, Brazil, CMIP6, BCC-CSM2-MR, historical, South America, RiskClima" ; :source = "Derived from CMIP6 BCC-CSM2-MR historical daily atmospheric fields (ua, va, zg)" ; :methodology = "Creation and Assessment of an Index for Atmospheric Blockings in Brazil\'s Central Region based on Cataldi et al. (2024) (https://doi.org/10.33552/AHM.2024.01.000519), that establishes an atmospheric blocking criterion: a day is classified as blocking when both relative vorticity at 850 hPa, relative vorticity at 500 hPa and geopotential height anomaly at 500 hPa are > 0 and hold simultaneously, sustained for at least 3 consecutive days. Once the persistence threshold is reached, the preceding days in the window are retroactively flagged as blocking. Vorticity is derived from ua/va. The zg500 anomaly is computed against the model\'s own historical climatology (1980-2010)." ; :spatial_coverage = "Domain 10S-25S, 60W-40W, split into 7 sub-regions, each provided as a separate variable (BLT, BLN, BLN_h1, BLN_h2, BLS, BLS_h1, BLS_h2); Boundaries defined in Cataldi et al. (2024)." ; :history = "2026-07-03T19:32:26Z Generated from CSV" ; :creation_date = "2026-07-03T19:32:26Z" ; :creator = "Marcio Cataldi <