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First Ten-year CO2 monitoring Record at Mexico High-Altitude Global Climate Observatory in (MEX) at 4,465 M.a.s.l., Compared with Mauna Loa Observatory. (MLO) at 3,397 M.a.s.l.

L.R. Acosta and F. Menendez-Roa

Climate Institute México & América Latina , Mexico City, Mexico; 202-536-5276, E-mail: acosta@clima.org

The High-Altitude Global Climate Observatory (MEX) located at 4,464 m.a.s.l. in Sierra Negra Volcano (Long 97°w10' & Lat 19°n59'), completed its first ten-year CO2 monitoring period (2009-2018). Designed to fill a “crucial-gap” in the Global Green House Gas Reference Network (GGGRN), MEX is located near the Gulf of México, aligned at similar latitude to the Mauna Loa (MLO) baseline climate observatory (3,397 m.a.s.l.), that has been in operation since 1958. The ten-year MEX CO2 data record is presented, reaching a maximum of 414.1 ppm and an average of 396.6 ppm with and an increasing tendency of 2.38 ppm per year. The MEX CO2 record is compared against the MLO CO2 data for the same ten-year monitoring period (2009-2018). MLO COdata record reached a maximum of 412.3 ppm, with a ten-year average of 397.8 ppm with and an increasing trend of 2.32 ppm per year. Both mountain-top monitoring sites, with 6,000 kms distance in-between, report a 99.7% coincidence on the COmeasurements over a ten-year monitoring period. If the current increasing trend continues, it is projected that both sites, MEX and MLO will report equal concentrations of CO2 in 2027, reaching 427 ppm. The extra-dry, high-altitude tropical location above the boundary region, makes of the MEX observatory a prime location for conducting Green House Gases (GHG) monitoring, including CH4, aerosols, radiation and other essential climate variables. The High-Altitude Observatory development and programs are discussed.

Figure 1

Figure 1. Location of the High-Altitude Global Climate Observatory above 4,500 m.a.s.l. in Sierra Negra Volcano in Mexico (MEX). Since 2009 the observatory contributes to the WMO-GAW global network and the Global Green House Gas Reference Network (GGGRN). It is aligned at similar latitude (19N) than the Mauna Loa Observatory (MLO) in Hawaii.

Figure 2

Figure 2. The chart shows ten-year (2009-2018) CO 2 concentration levels comparison between Mexico High Altitude Climate Observatory (MEX) and Mauna Observatory (MLO).