Atmospheric H2 Concentrations from the CSIRO GASLAB Flask Sampling Network

An annual cycle of H2 is evident, reflecting the seasonal nature of some of the major sources and sinks (Novelli et al., 1999). Annual average concentrations since 1992 have varied between 473 and 499 ppb, peaking in 1998. The annual increase for H2 at Alert was highest in 1998, the same year in which the maximum globally averaged growth rate occurred (Langenfelds et al., 2002). An annual cycle of H2 is evident, reflecting the seasonal nature of some of the major sources and sinks (Novelli et al., 1999). Annual average concentrations since 1992 have varied between 514 and 531 ppb, peaking in 1999. The maximum globally averaged growth rate for H2 occurred during 1998 (Langenfelds et al., 2002). An annual cycle of H2 is evident, reflecting the seasonal nature of some of the major sources and sinks (Novelli et al., 1999). Annual average concentrations since 1992 have varied between 515 and 535 ppb, peaking in 1999. The maximum globally averaged growth rate for H2 occurred during 1998 (Langenfelds et al., 2002). An annual cycle of H2 is evident, reflecting the seasonal nature of some of the major sources and sinks (Novelli et al., 1999). Annual average concentrations since 1993 have varied between 498 and 518 ppb, peaking in 1999. The greatest increases at Estevan Point occurred between 1995 and 1997; preceding the maximum globally averaged increase, which occurred during 1998 (Langenfelds et al., 2002). An annual cycle of H2 is evident, reflecting the seasonal nature of some of the major sources and sinks (Novelli et al., 1999). Annual average concentrations since 1992 have varied between 515 and 535 ppb, peaking in 1998. The maximum increase at Macquarie Island Loa occurred from 1997-1998; the maximum globally averaged growth rate for H2 occurred in 1998 (Langenfelds et al., 2002).氢气（H₂）存在显著的年循环特征，反映了部分主要源与汇的季节特性（Novelli等，1999）。自1992年以来，年均浓度在473~499 ppb之间波动，并于1998年达到峰值。阿尔特站（Alert）的氢气年增量在1998年达到最高，同年全球平均氢浓度增长率也达到峰值（Langenfelds等，2002）。 氢气（H₂）存在显著的年循环特征，反映了部分主要源与汇的季节特性（Novelli等，1999）。自1992年以来，年均浓度在514~531 ppb之间波动，并于1999年达到峰值。全球平均氢浓度增长率的最大值出现在1998年（Langenfelds等，2002）。 氢气（H₂）存在显著的年循环特征，反映了部分主要源与汇的季节特性（Novelli等，1999）。自1992年以来，年均浓度在515~535 ppb之间波动，并于1999年达到峰值。全球平均氢浓度增长率的最大值出现在1998年（Langenfelds等，2002）。 氢气（H₂）存在显著的年循环特征，反映了部分主要源与汇的季节特性（Novelli等，1999）。自1993年以来，年均浓度在498~518 ppb之间波动，并于1999年达到峰值。埃斯特万角（Estevan Point）的氢气年增量最大值出现在1995年至1997年间，早于1998年出现的全球平均氢浓度增长峰值（Langenfelds等，2002）。 氢气（H₂）存在显著的年循环特征，反映了部分主要源与汇的季节特性（Novelli等，1999）。自1992年以来，年均浓度在515~535 ppb之间波动，并于1998年达到峰值。麦夸里岛洛阿（Macquarie Island Loa）的氢气年增量最大值出现在1997年至1998年间，全球平均氢浓度增长率的最大值同样出现在1998年（Langenfelds等，2002）。