Stalagmites provide one of the few high-quality proxy records of the Thailand monsoon. The Namjang (NJ) cave (19°40′30″N, 98°12′12″E; 923 m a.s.l.), which is situated in the data-scarce region of northwestern Thailand, serves as a unique and important site that offers great potential for multi-proxy climate reconstruction. We present new data on stable oxygen isotopic (δ¹⁸O) compositions and growth rates of aragonite stalagmites based on an in situ cave and climate monitoring study performed between August 2012 and October 2013. The dominant factors that control the variations in the δ¹⁸O values of rainfall, drip water, and modern aragonite precipitate as well as the variations in the modern speleothem deposition rates and drip water hydrochemical properties were determined to correctly interpret the climatic signals of the parameters that are derived from speleothems. The intraseasonal variations in rainfall δ¹⁸O values were faithfully recorded from cave drip water isotopic signals. The monthly mean values of δ¹⁸O in cave drip water were lower in the rainy season and higher in the dry seasons and shifted from approximately − 4 in the early rainy months to approximately − 6‰ in the late rainy months. These variations have implications for the use of speleothem δ¹⁸O from the NJ cave as a proxy of the seasonal variations in monsoon rainfall δ¹⁸O and changes in moisture source trajectories. The deposition rates of modern speleothem deposits are primarily controlled by drip water flow rates, which are linked to the amount of water recharge in the cave during the summer monsoon season. There was a significant correlation between the drip rate and amount of carbonate precipitation for the drip sites NJ-1 (r = 0.54, p < 0.040) and NJ-1202 (r = 0.76, p < 0.004). Combinations of different parameters and proxies from this area could provide the potential for the further development of multi-proxy climate reconstructions over different time scales.

石笋提供了泰国季风的少数优质代理记录之一。位于泰国西北部数据稀缺地区的Namjang（NJ）洞穴（北纬19°40′30″，东经98°12′12″； 923 m）是独特而重要的遗址，多代理气候重建的巨大潜力。我们对稳定同位素氧提出了新的数据（δ ¹⁸ O）成分和原位洞穴和气候监测研究基于一个文石石笋的增长率2012年8月和2013年十月之间进行控制的δ变化的主导因素¹⁸确定降雨，滴水和现代文石沉淀物的O值，以及现代针叶煤沉积速率和滴水水化学性质的变化，以正确解释源自针叶煤的参数的气候信号。在降雨季节内变化δ ^18个O值被忠实地从洞穴滴水同位素信号记录下来。δ的月平均值¹⁸洞穴滴水Ø是在旱季雨季较低和较高和大约转移-在初雨月4至约-后期多雨月6‰。这些变化对使用钟乳石的δ含义¹⁸ O，使其脱离NJ洞穴作为季节变化的一个代理在季风降水δ¹⁸ O和水分源轨迹的变化。现代泥炭纪沉积物的沉积速率主要受滴水流速控制，滴水流速与夏季季风季节洞穴中的补水量有关。NJ-1（r = 0.54，p <0.040）和NJ-1202（r = 0.76，p <0.004）滴水点的滴水速度与碳酸盐沉淀量之间存在显着相关性。来自该区域的不同参数和代理的组合可以为在不同时间尺度上进一步发展多代理气候重建提供潜力。