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~ f-" .. <:.:) l\) " to .. " " s" ~ , .. s u " .. '" . " , '" ,~ A's a '- uS .. , ...:t+ . t. +. * ft. +tt.. ~ +:::~+':*++ '. ++t ::++ :: .. .. ++ , .. ~*... ... ++ ++* .. +:.. **+++ , - , " .~ '.. .-'~ . . .. ++* .' " " .. .. Year in the 20th Century " Figure 6. Linear trend of magnesium ion concentration with a linear correction for the variability of stream~ flow for the Colorado River near the Grand Canyon, December through March. 1926-61. . . +ttt++ t .. ..i.."'.+++ ++ * ..'" i*i +.++++t+*+, ... .. ... t .... ........ .. it..!, ~ .. :+ ++ ++* ... ... t'" ... +++*t ++ +t. .. ++t " '" '" Year In the 20th Century Figure 7. Log-log trend of magnesium ion concentration with a power correction for the variability of stream~ flow f9r the Colorado River near the Grand Canyon, December through March, 1926-61. " " 36 ... A's a '- J . +tH++: +1' .+. I ...'" t ',t +t.ttt..+.. .. t +* , ++ ++ , .t.t. ++.. ,'. ... .. +t+.;+ p..f $+! ++ ++ +1'$ .. ++t .' '" " io ;, " .. " Year In the 20th Century Figure 8. Semilogtrend of magnesium ion concentration with a power correction for the variability of stream- flow for the Colorado River near the Grand Canyon, December through March, 1926-61. ,~ '" :;r '-", ~ '" ~ , , , . " . . .. ~ ." , .. .. ++ .. ....t;- .. ' 't: . .. +*.+ +tt... +t . " . . , , .. . '" , " ;, " " " Year in the 2ath C",,,,b...v io Figure 9. Magnesium ion concentration corrected for streamflow by the residence time equation. The ordinate is the product of the mass transfer coef- ficient (k) and the solid~liquld contact area (A) up- stream of the gaging station on the Colorado River near the Grand Canyon, Oecember through March, 1926-61.