Abstract
Some studies indicate that the solar modulation of galactic cosmic ray (GCR) particles has profound consequences for Earth9s climate system. A corollary of the GCR-climate theory involves a link between Earth9s magnetic field and climate, since the geomagnetic field also modulates the GCR flux reaching Earth9s 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 δ 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 δ 18 O records and the dipole moment, suggesting that Earth9s 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 Earth9s climate in the past, our study also provides some degree of support for the controversial link between GCR particles, cloud formation, and climate.
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