For example, methane concentrations fluctuate mainly at the 22,000-year tempo of an orbital cycle called precession.
For example, methane concentrations fluctuate mainly at the 22,000-year tempo of an orbital cycle called precession.
举例来说，甲烷浓度波动的周期为2万2000年，与称为「岁差」的轨道周期相同。