A couple empirical equations to possess firn densification had been obtained,provided firn porosity just like the a purpose of overburden pressure. In the step onest equation, thereduction ratio regarding porosity for the firn is believed to get proportional toward increasing ratioof excess tension while the mth fuel off new porosity. The brand new porosity exponent m are going to be alongside -dos, in order to possess an only-match fourteen breadth-density users fromGreenland and you may Antarctica. Regarding the next equation, new protection ratio away from porosity wasassumed to improve proportionally to the increment of overload stress and you will thenth power of one’s porosity. Probably the most satisfactory beliefs of your own exponent range between -step 1 to just one. It has been suggested that firn thickness, computed mainly because of the overburdenpressure and you can firn temperature, subscribe a lesser education.
1 Inclusion
The new sales procedure for firn to help you freeze is amongst the really practical victims in the polar ice-piece studies. Enough concepts about your inactive densification from firn enjoys become recommended ( Source Robin Robin, 1958 Source Schytt Schytt, 1958 Resource Bader Bader, 1960, 1962 Resource Benson Benson, 1962 Anderson and you will Resource Benson Benson, 1963 Source Kojima Kojima, 1964 Reference Gow Gow, 1975). not, a thorough model along with grains-paying off, sublimation/condensation, volume/ skin diffusion, ice deformation and recrystallization procedure wasn’t securely based. The densification processes have also read empirically ( Site Robin Robin, 1958 Reference Schytt Schytt, 1958 Source Herron and Langway Herron and you can Langway, 1980 Reference Ling Ling, 1985 Reference Langway, Shoji, Mitani and Clausen Langway while some, 1993). Resource Schytt Schytt (1958) discover an enthusiastic empirical relatives between firn thickness while the pounds out of overlying snow. Continue reading “An enthusiastic empirical relation anywhere between excess tension and you will firn thickness”