Dynamics of hydrothermal seeps from the Salton Sea geothermal system (California, USA) constrained by temperature monitoring and time series analysis
Dynamics of hydrothermal seeps from the Salton Sea geothermal system (California, USA) constrained by temperature monitoring and time series analysis
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受温度监测和时间序列分析约束的索尔顿海地热系统（美国加利福尼亚州）热液渗漏动态
DOI：
10.1029/2008jb006247
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发表时间：
2009
影响因子：
--
通讯作者：
Y. Podladchikov
中科院分区：
文献类型：
--
作者：
H. Svensen;Ø. Hammer;A. Mazzini;N. Onderdonk;S. Polteau;S. Planke;Y. Podladchikov
在戴维斯-施里姆夫渗漏场(�20,000平方米)渗漏。为了了解该系统的驱动机制，我们通过对2006年12月至2007年3月期间两个水池和两个狮子管的温度进行了2180小时(90.8天)的监测，每个站总共进行了32,700次测量，从而研究了该系统的渗漏动力学。利用互相关、自相关和谱分析、自回归建模等统计方法对时间序列进行了分析。富水池的温度从不超过34.0摄氏度，其特点是受气温日循环控制的温度变化幅度较小。从2007年12月至2008年4月对其中一个水池进行的第二次温度监测(120天)可以明显看出这些结果的长期有效性。与池塘形成鲜明对比的是，富含泥土的鹰头狮有着截然不同的行为。鹰头鹰的温度更高(最高为69.7摄氏度)，幅度变化很大(标准差为6.4)，覆盖了来自外部昼夜强迫的任何信号。自回归模型显示，在鹰头鹰温度时间序列中存在明显的冷热脉冲，幅度高达3摄氏度。这些脉冲可能反映了来自SSG的热液通量变化和金丝雀内部起泡活动的局部时间变化的组合。
seeps in the Davis-Schrimpf seep field (� 20,000 m 2 ). In order to understand the mechanisms driving the system, we have investigated the seep dynamics of the field by monitoring the temperature of two pools and two gryphons for 2180 h (90.8 days) in the period from December 2006 to March 2007, with a total of 32,700 measurements per station. The time series have been analyzed by statistical methods using cross correlation, autocorrelation and spectral analysis, and autoregressive modeling. The water-rich pools never exceed 34.0C and are characterized by low-amplitude temperature variations controlled by the diurnal cycles in air temperature. The long-term validity of these results is evident from a second period of temperature monitoring of one of the pools from December 2007 to April 2008 (120 days). In contrast to the pools, the mud-rich gryphons have a strikingly different behavior. The gryphons are hotter (maximum 69.7C) and have large amplitude variations (standard deviation of 6.4) that overprint any signal from external diurnal forcing. Autoregressive modeling shows the presence of distinct hot and cold pulses in the gryphon temperature time series, with amplitudes up to 3C. These pulses likely reflect a combination of hydrothermal flux variations from the SSGS and the local temporal changes in bubbling activity within the gryphons.