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Is there a link between Earth's magnetic field and low-latitude precipitation?

Mads Faurschou Knudsen and Peter Riisager
Is there a link between Earth's magnetic field and low-latitude precipitation?
Geology (Boulder) (January 2009) 37 (1): 71-74


Some studies indicate that the solar modulation of galactic cosmic ray (GCR) particles has profound consequences for Earth's climate system. A corollary of the GCR-climate theory involves a link between Earth's magnetic field and climate, since the geomagnetic field also modulates the GCR flux reaching Earth's atmosphere. In this study, we explore this potential geomagnetic-climate link by comparing a new reconstruction of the Holocene geomagnetic dipole moment with high-resolution speleothem data from China and Oman. The speleothem delta (super 18) O data represent proxy records for past precipitation in low-latitude regions, which is a climate parameter that is likely to have been sensitive to variations in the GCR flux modulated by the dipole moment. Intriguingly, we observe a relatively good correlation between the high-resolution speleothem delta (super 18) O records and the dipole moment, suggesting that Earth's magnetic field to some degree influenced low-latitude precipitation in the past. In addition to supporting the notion that variations in the geomagnetic field may have influenced Earth's climate in the past, our study also provides some degree of support for the controversial link between GCR particles, cloud formation, and climate.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 37
Serial Issue: 1
Title: Is there a link between Earth's magnetic field and low-latitude precipitation?
Affiliation: University of Oxford, Department of Earth Sciences, Oxford, United Kingdom
Pages: 71-74
Published: 200901
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 31
Accession Number: 2009-020471
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2009016
Illustration Description: illus.
N25°16'60" - N25°16'60", E108°04'60" - E108°04'60"
N17°10'00" - N17°10'00", E54°17'60" - E54°17'60"
Secondary Affiliation: Geological Survey of Denmark and Greenland, DNK, Denmark
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200912
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