Quantitative Estimation of Black Carbon in the Glacier Ampay-Apurimac Volume 9, Issue 1, 1080342 Carolina Soto Carrión, Carl G. Schmitt, Juan J. Zuñiga Negrón, Wilber Jiménez Mendoza, Oscar Arbieto Mamani, Rosmery S. Pozo Enciso, Sulema J. Guevara Sarmiento, Maxwell S. Rado Cuchills